Topic Overview
Is this topic for you?
This topic is about
non-melanoma skin cancer, including
basal cell cancer and
squamous cell cancer. For information about
melanoma skin cancer, see the topic
Skin Cancer, Melanoma.
What is non-melanoma skin cancer?
Skin cancer is the abnormal growth of cells in the skin. It is the most
common type of cancer. It is almost always cured when it is found early and
treated. So it is important to see your doctor if you have changes in your
skin.
Most skin cancers are the non-melanoma type. There are two
main types of non-melanoma skin cancer:
- Basal cell carcinoma. Most non-melanoma
cancers are this type. It can damage deeper tissues, such as muscles and bones.
It almost never spreads to other parts of the body.
- Squamous cell carcinoma. This type is
less common. It often develops from a small rough spot that grows in sun-damaged skin. It
sometimes spreads to other parts of the body.
There are other types of skin cancer that are not melanoma. But these are much less common. They include Merkel cell carcinoma and several kinds of sarcomas.
What causes it?
Non-melanoma skin cancer is usually
caused by too much sun. Using tanning beds or sunlamps too much can also cause
it.
How is non-melanoma skin cancer diagnosed?
Skin
cancer usually appears as a growth that changes in colour, shape, or size. This
can be a sore that does not heal or a change in a mole or skin growth. These changes
usually happen in areas that get the most sun—your head, neck, back, chest, or
shoulders. The most common place for skin cancer is your nose.
Your doctor will use a
biopsy to find out if you have skin cancer. This means
taking a sample of the growth and sending it to a lab to see if it contains
cancer cells.
What increases your risk for non-melanoma skin cancer?
The single greatest risk is from ultraviolet (UV) radiation. This comes from exposure to the sun, especially during the middle of the day. It also comes from exposure to artificial sources of UV, such as indoor tanning.
If you have light skin that sunburns easily, you are more likely to get
skin cancer.
Your risk is higher if you are male or if you are
over 40. Your risk is higher if others in your family have had it or if you
have had it before.
You may also be more likely to get it if you
have been exposed often to strong
X-rays, to certain chemicals (such as arsenic, coal
tar, and creosote), or to radioactive substances (such as radium).
How is it treated?
Your doctor will want to remove
all of the cancer. There are several ways to do this. The most common way is to
numb your skin so that it does not hurt, then cut out the cancer. You will be
awake while this is done.
This surgery almost always cures
non-melanoma skin cancer. Other treatments include radiation, medicines that are put on the skin (topical therapies), and photodynamic therapy (PDT).
After your treatment, you will need
regular checkups, because having skin cancer once means you are more likely to
get it again.
Can non-melanoma skin cancer be prevented?
You can
prevent it by being careful in the sun. Stay out of the sun at midday, when the
sun's rays are strongest. Wear sunscreen or other sun protection. Do not use
tanning booths or sunlamps.
Frequently Asked Questions
Learning about skin cancer: | |
Being diagnosed: | |
Getting treatment: | |
Living with skin cancer: | |
Cause
Non-melanoma skin cancer is usually
caused by overexposure to the sun and its
ultraviolet (UV) rays. Overexposure to UV rays can
result from:
- Having severe sunburn and blistering, especially during
childhood.
- Spending a lot of time in the sun over many years.
- Using tanning beds or sunlamps, which are artificial sources of
UV rays.
Other possible causes of skin cancer include repeated
exposure to
X-rays, certain chemicals (such as arsenic, coal tar,
creosote), and radioactive substances (such as radium). Skin cancer may also be
caused by ionizing radiation treatments for skin conditions such as
psoriasis or
acne.
Symptoms
Non-melanoma skin cancer may appear as a change in the
skin, such as a growth, an irritation or sore that does not heal, or a change
in a mole or a skin growth.
Basal cell carcinoma usually affects the head, neck, back, chest, or shoulders. The
nose is the most common site. Signs of basal cell carcinoma can vary depending on the type and may
include skin changes such as a:
- Firm, pearly bump with tiny blood vessels that look spidery (telangiectasias).
- Red, tender, flat spot that bleeds easily.
- Small, fleshy bump with a smooth, pearly appearance, often with a
depressed centre.
- Smooth, shiny bump that may look like a mole or
cyst.
- Patch of skin, especially on the face, that looks like a scar and
is firm to the touch.
- Bump that itches, bleeds, crusts over, and then repeats the cycle
and has not healed in a few weeks.
- Change in the size, shape, or colour of a mole or a skin growth.
Squamous cell carcinoma usually affects
the face, head, or neck. Signs of squamous cell carcinoma include any:
- Persistent, firm, red bump on sun-exposed skin.
- Patch of skin that feels scaly, bleeds, or develops a crust. The
patch may get bigger over a period of months and form a sore.
- Skin growth that looks like a wart.
- Sore that does not heal or an area of thickened skin on the lower
lip, especially if you smoke or use chewing tobacco or your lips are often
exposed to the sun and wind.
Other conditions, such as
actinic keratosis, may have symptoms similar to skin
cancer. It is important to have any new or persistent skin change evaluated by
your doctor.
What Happens
Non-melanoma skin cancer usually develops slowly, invading and destroying nearby tissues.
It may take months or years for basal cell or squamous cell carcinomas to
develop. Because of this slow growth, skin cancer can often be detected and
treated early in its development, increasing the chance for a cure.
Basal cell carcinoma
Basal cell carcinoma can affect the surface of the skin where it appears. If it is not treated, it can grow larger and cause problems beneath the skin, sometimes damaging the muscles and bones. Basal cell carcinoma very rarely spreads (metastasizes) to other
parts of the body.
After you have one basal cell carcinoma, you are more likely to have another one develop in a new place. If basal cell carcinoma comes back at the same place (recurs), it may grow
faster and cause more tissue damage.
Squamous cell carcinoma
Squamous cell carcinoma often starts from a small rough spot in sun-damaged skin (actinic keratosis). Or it may develop from an early form of skin cancer called Bowen's disease. If a squamous cell carcinoma is not treated, it may spread.
What Increases Your Risk
Risk factors (things that increase your risk) for
non-melanoma skin cancer include:
- Sunlight, sun lamps, or tanning beds. These expose you to ultraviolet (UV) radiation.
- UV radiation affects people of all skin types, but especially those with light skin
colour, freckles, blond or red hair, and blue or light-coloured eyes.
- Living where you get high levels of UV radiation. People living closer to the equator get more UV radiation. And people who live at higher altitudes, such as in the mountains, get more UV radiation.
- A family history of skin cancer or a personal history of skin
cancer. Or other things that affect your skin, such as:
- Inherited genetic disorders, such as xeroderma pigmentosum.
- A history of severe
sunburns, especially during childhood.
- Scars from severe burns or inflammatory skin conditions.
- Being older than 40.
- Being male. Men develop skin cancer more often than women.
- Smoking.
- Repeated exposure to
X-rays, certain chemicals (such as arsenic, coal tar,
creosote), and radioactive substances (such as radium).
- Being infected with a certain type of human papillomavirus (HPV).
Basal cell and
squamous cell carcinomas can occur in people with dark
skin. But these cancers are much more common in people with light skin.
The risk of squamous cell carcinoma is higher in people who have weakened immune systems. This includes people who have had
organ transplants and take medicines to prevent rejection of the new
organ.
When To Call a Doctor
Call your doctor if you have an
irritated or irregular skin growth. This includes any:
- Firm, pearly bump with tiny blood vessels that look spidery (telangiectasias).
- Red, tender, flat spot that bleeds easily.
- Small, fleshy bump with a smooth, pearly appearance, often with a
depressed centre.
- Smooth, shiny bump that may look like a mole or
cyst.
- Patch of skin, especially on the face, that looks like a scar and
is firm to the touch.
- Bump that itches, bleeds, crusts over, and then repeats the cycle
and has not healed in 3 weeks.
- Change in a mole or a skin growth, including a change in size, shape, or
colour.
- Area of normal skin that quickly changes shape or
appearance.
Be sure to show your doctor any skin growths that concern
you so that they can be evaluated and treated if needed.
Who to see
Your
family doctor or general practitioner can examine and diagnose a suspicious
skin growth.
You may be referred to a specialist who can remove a large skin growth or one in a noticeable area
while minimizing scars that may result from surgery. These specialists include:
To prepare for your appointment, see the topic Making the Most of Your Appointment.
Examinations and Tests
Non-melanoma skin cancer is diagnosed by:
- Your medical history. Your doctor will ask when the skin change
occurred, whether you have been exposed to substances (such as arsenic) that
can cause skin cancer, and whether you have any personal or family history of
skin cancer.
- A
physical examination of the skin growth. Your doctor
can often tell what a skin growth is by looking at it. He or
she may decide to monitor changes in the skin growth or take a sample of the
skin growth for further testing.
- A
skin biopsy. This is usually done when an area of skin
has changed colour, shape, size, or appearance or has not healed and skin cancer
is suspected. A skin biopsy also may be done if the cause of a skin problem is
not easily identified.
Early detection
Take steps to detect skin cancer early:
- Examine your skin once a month, and ask your doctor to
look at any suspicious skin growths.
- Talk to your doctor about your own personal risk for skin
cancer so that you understand the precautions that you need to take.
- Have your doctor look for any suspicious skin growths during
any health examination.
Treatment Overview
The goals of treatment for
non-melanoma skin cancer are to:
- Remove the entire skin cancer and a margin of skin tissue around
the cancer to reduce the chance of recurrence.
- Preserve nearby skin tissue that is free of cancer and minimize
scarring after surgery.
Initial treatment
Treatment for
non-melanoma skin cancer depends on the size and
location of the cancer, whether it is
basal cell or
squamous cell, and your age and overall health.
The type of treatment will also depend on whether you have had skin cancer at that place before and whether the cancer is in a place where you have had radiation therapy. Because skin cancer usually grows slowly, it often can be detected early and
successfully treated.
The most common
treatment is surgery to destroy or remove the entire skin growth, including a
margin of cancer-free tissue around the growth. Most surgical treatments are
very effective, with high cure rates.
The main treatment options are:
- Mohs micrographic surgery. This surgery removes
the skin cancer one layer at a time, checking each layer for cancer cells
right after it is removed.
- Excision. Excision removes the skin cancer
along with some healthy skin tissue around it (margin).
- Radiation therapy. Radiation therapy uses X-rays or other types of radiation to kill cancer cells. It may done if surgery isn't an option.
- Curettage and electrosurgery. Curettage uses a
spoon-shaped instrument (curette) to scrape off the skin cancer, and electrosurgery controls the bleeding and destroys any remaining cancer cells.
- Cryosurgery. Cryosurgery destroys the skin cancer by
freezing it with liquid nitrogen.
Each of these treatments has
advantages and disadvantages. Discuss your options
with your doctor.
Basal cell carcinoma may also be treated with:
Ongoing treatment
Follow-up treatment for
non-melanoma skin cancer includes
skin self-examinations and regular examinations by your doctor. These examinations are extremely
important to reduce the risk of the cancer coming back (recurrence).
Almost half of people who have a non-melanoma skin cancer will develop another one within 5 years.1 Your doctor may schedule you for examinations as often as every 3 to 6 months
for the first 2 years and yearly after that, especially for
squamous cell carcinoma.
Treatment if the condition gets worse
Surgery is
usually very effective for both
basal and
squamous cell carcinoma.
But sometimes the cancer can come back (recur). Or in rare cases, it may spread (metastasize). Metastasis is more likely with squamous cell carcinoma than with basal cell.
If basal cell carcinoma comes back, treatment is usually Mohs surgery. But for squamous cell carcinoma that comes back, treatment may include surgery (excision or Mohs surgery) or radiation therapy.
If the cancer does spread, chemotherapy may be used. Your doctor may suggest that you enroll in a clinical trial if one is available.
What to think about
Precancer skin growths, such as
actinic keratoses and Bowen's disease, can develop into squamous cell skin cancer if they are not treated.
You can find more information about skin cancer online at the:
- Canadian Cancer Society website at www.cancer.ca.
- U.S. National Cancer Institute website at www.cancer.gov.
Prevention
Most
non-melanoma skin cancer can be prevented by protecting
your skin from the sun and
ultraviolet (UV) radiation.
- Limit your exposure to the sun, especially from 10 a.m. to 4
p.m., the hours of peak ultraviolet exposure.
- Wear protective clothing, including a wide-brimmed hat, a
long-sleeved shirt, and pants.
- Wear sunglasses that block UV rays.
- Use a broad-spectrum sunscreen that has a
sun protection factor (SPF) of at least 15. A broad-spectrum sunscreen protects the skin from both UVA and UVB rays.
- Use lip balm or cream that has sun protection factor (SPF) to
protect your lips from getting sunburned or developing cold sores.
- Avoid tanning booths and sunlamps, which emit UV radiation and
can cause skin damage.
Skin protection for children
Children and babies
should be protected from the sun. You should start protecting your child from
the sun when he or she is a baby. Because children and teens spend a lot of
time outdoors playing, they get most of their lifetime sun exposure in their
first 18 years.
- Teach your children that it is important to protect their skin
from the sun.
- Have your children wear protective clothing, sunglasses, and a
hat with a wide brim when they are in the sun.
- Have your children wear sunscreen. Choose a sunscreen with SPF
15 or higher. Follow the instructions on the sunscreen. Put sunscreen on your skin 20 minutes before you go out and reapply 20 minutes after being
out in the sun. This helps ensure you applied the sunscreen evenly and that you are better protected. Reapply sunscreen after
2 hours in the sun or water, even if the sunscreen is waterproof.
- Keep babies younger than 6 months out of direct
sunlight. Do not use sunscreen on babies younger than age 6 months.
Some people believe that a tan may protect them
against a sunburn and skin damage. But the amount of sun exposure needed to get
a tan can by itself cause skin damage.
Skin Cancer: Protecting Your Skin
Home Treatment
Home treatment after a skin
cancer is removed includes regular use of skin protection measures to prevent a return
(recurrence) of
non-melanoma skin cancer and regular examinations to watch for
suspicious skin changes.
Perform a
skin self-examination once a month.
- Check your skin and skin growths for any changes in colour, shape,
size, or appearance.
- Look for any diseased area of skin that has not healed.
- Report any suspicious changes in your skin to your doctor.
Certain medicines, such as some
antibiotics or
diuretics, can make your skin more sensitive to the
sun's rays. Ask your doctor about this potential side effect of your medicines,
and take extra precautions if needed.
Medications
Medicines are rarely used to treat
non-melanoma skin cancer. Surgery is the most common and the most effective treatment. But when surgery is not possible, your doctor may suggest medicines. Medicines may also be used when a skin cancer is too large for surgery or when new skin cancers keep appearing.
Medicine choices
Medicines that may be used to treat basal cell carcinoma include:
- Fluorouracil (5-FU). This cream or lotion is used to treat carcinomas that are only in the top layer
of skin (superficial).
- Imiquimod (Aldara). Imiquimod is used to
treat superficial basal cell cancer on the skin of the body, neck, arms, or
legs, but it is not approved for treating the face.
Medicines that may be used to treat squamous cell carcinoma include:
People treated with
medicines will need to have regular follow-up visits with their doctors to make sure
the skin cancer is gone.
Chemotherapy
may be used to destroy cancer cells in the small number of people who have
basal cell or
squamous cell carcinoma that has spread (metastasized)
to other organs in the body, though metastasis is rare.
What to think about
Medicines such as 5-FU and imiquimod may cause your skin to be sore. Your skin may turn red, swell, itch, or break out in a rash. Your skin may also be sensitive to sunlight. If your skin turns too red or raw, your doctor may stop the treatment.
Surgery
Surgery is the most common and most successful
method of treating
non-melanoma skin cancer. The goals of surgery are
to:
- Remove the entire skin cancer and a margin of healthy skin tissue
around the cancer to reduce the chance of recurrence.
- Preserve nearby skin tissue that is free of cancer and minimize
scarring after surgery.
Surgery choices
The main types of surgery for non-melanoma skin cancer
include:
- Mohs micrographic surgery. This surgery removes
the skin cancer one layer at a time, checking each layer for cancer cells
right after it is removed.
- Excision. Excision removes the skin cancer
along with some healthy skin tissue around it (margin).
- Curettage and electrosurgery. Curettage uses a
spoon-shaped instrument (curette) to scrape off the skin cancer, and electrosurgery controls the bleeding and destroys any remaining cancer cells.
Other types of surgery that may be done include:
- Cryosurgery. Cryosurgery destroys the skin cancer by
freezing it with liquid nitrogen.
- Laser surgery. Lasers use an intense beam of light to remove skin cancer.
- Dermabrasion. Dermabrasion scrapes off cancer cells in the top layer of skin using a swirling wire brush or small particles.
Each type of treatment has
advantages and disadvantages. Discuss your options
with your doctor.
What to think about
If
squamous cell carcinoma has spread to the
lymph nodes, surgery to remove the affected lymph
nodes (lymphadenectomy) may be done.
Radiation or
chemotherapy may be recommended after surgery.
Other Treatment
Radiation therapy may be used to treat skin cancers in some cases. It may also be recommended for people who may not be able to have surgery because of the location of the skin cancer.
Radiation therapy may also be a treatment choice if age or other health
conditions make surgery too risky. Radiation therapy is most often used for
older adults. It may lead to other skin cancers in younger people as they
age.
Radiation therapy may be an effective treatment for people who have low-risk, shallow cancers, such as squamous cell carcinoma in situ (Bowen's disease).
Other treatments for people who cannot have surgery or radiation include photodynamic therapy (PDT), which uses medicines and a special light to treat skin cancer on or very close to the surface of the skin.
Other Places To Get Help
Organizations
| American Academy of Dermatology |
| P.O. Box 4014 |
| Schaumburg, IL 60168 |
| Phone: | 1-866-503-SKIN (1-866-503-7546) toll-free
(847) 240-1280 |
| Fax: | (847) 240-1859 |
| Email: | MRC@aad.org |
| Web Address: | www.aad.org |
| |
The American Academy of Dermatology (AAD) provides information
about the care of skin. You can locate a dermatologist in your
area by using their "Find a Dermatologist" tool. Or you can read the latest news in dermatology. "SPOT Skin Cancer" is the AAD's program to reduce deaths from melanoma. There is also a link called "Skin Conditions" that has information about many common skin problems. |
|
| American Cancer Society (ACS) |
| Phone: | 1-800-ACS-2345 (1-800-227-2345) |
| Web Address: | www.cancer.org |
| |
The American Cancer Society (ACS) conducts educational
programs and offers many services to people with cancer and to their families.
Staff at the toll-free number have information about services and activities
in local areas and can provide referrals to local ACS divisions. |
|
| Canadian Cancer Society |
| 55 St. Clair Avenue West |
| Suite 300 |
| Toronto, ON M4V 2Y7 |
| Phone: | 1-888-939-3333 |
| Phone: | (416) 961-7223 |
| Fax: | (416) 961-4189 |
| Email: | ccs@cancer.ca |
| Web Address: | www.cancer.ca |
| |
The Canadian Cancer Society (CCS) is a national,
community-based organization that provides information about cancer prevention,
care, and treatment. The CCS also provides funding for cancer research. |
|
| Canadian Dermatology Association |
| 1385 Bank Street |
| Suite 425 |
| Ottawa, ON K1H 8N4 |
| Phone: | 1-800-267-3376
(613) 738-1748 |
| Fax: | (613) 738-4695 |
| Email: | contact.cda@dermatology.ca |
| Web Address: | www.dermatology.ca |
| |
The Canadian Dermatology Association promotes research and
education for dermatologists, provides information and support for dermatology
patients, and offers public education materials on sun awareness and skin
care. |
|
| Skin Cancer Foundation (U.S.) |
| 149 Madison Avenue |
| New York, NY 10016 |
| Phone: | (212) 725-5176 |
| Email: | To send an email, go to www.skincancer.org/contact-us |
| Web Address: | www.skincancer.org |
| |
The Skin Cancer Foundation is committed to education, prevention, early detection, and prompt treatment of skin cancer. This website has information on skin cancer, prevention, and "Ask the Expert." It also features news and events. |
|
| U.S. National Cancer Institute (NCI) |
| 6116 Executive Boulevard |
| Suite 300 |
| Bethesda, MD 20892-8322 |
| Phone: | 1-800-4-CANCER (1-800-422-6237) |
| Web Address: | www.cancer.gov (or
https://livehelp.cancer.gov/app/chat/chat_launch for live help
online) |
| |
The National Cancer Institute (NCI) is a U.S. government
agency that provides up-to-date information about the prevention, detection,
and treatment of cancer. NCI also offers supportive care to people who have cancer
and to their families. NCI information is also available to doctors, nurses,
and other health professionals. NCI provides the latest information about
clinical trials. The Cancer Information Service, a service of NCI, has trained
staff members available to answer questions and send free publications.
Spanish-speaking staff members are also available. |
|
References
Citations
- National Comprehensive Cancer Network (2010). Basal cell and squamous cell skin cancers. NCCN Clinical Practice Guidelines in Oncology, Version 1. Available online: http://www.nccn.org/professionals/physician_gls/PDF/nmsc.pdf.
Other Works Consulted
- Habif TP, et al. (2011). Premalignant and malignant non-melanoma skin tumors. In Skin Disease: Diagnosis and Treatment, 3rd ed., pp. 464–507. Edinburgh: Saunders.
- Leung M (2011). Management of side effects of chemotherapy and radiation therapy. In C Repchinsky, ed., Therapeutic Choices, 6th ed., pp. 1663–1686. Ottawa: Canadian Pharmacists Association.
- Marks VJ, Hanson NW (2010). Non-melanoma skin cancer. In JC Hall, BJ Hall, eds., Sauer’s Manual of Skin Diseases, 10th ed., pp. 305–311. Philadelphia: Lippincott Williams and Wilkins.
- Ormerod A, et al. (2010). Basal cell carcinoma, search date December 2009. BMJ Clinical Evidence. Available online: http://www.clinicalevidence.com.
- Spencer JM (2010). Basal cell carcinoma. In MG Lebwohl et al., eds., Treatment of Skin Disease: Comprehensive Therapeutic Strategies, 3rd ed., pp. 78–82. Edinburgh: Saunders Elsevier.
- Waldorf HA (2010). Squamous cell carcinoma. In MG Lebwohl et al., eds., Treatment of Skin Disease: Comprehensive Therapeutic Strategies, 3rd ed., pp. 702–706. Edinburgh: Saunders Elsevier.
Credits
| By | Healthwise Staff |
|---|
| Primary Medical Reviewer | E. Gregory Thompson, MD - Internal Medicine |
|---|
| Specialist Medical Reviewer | Amy McMichael, MD - Dermatology |
|---|
| Last Revised | December 4, 2012 |
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