Some plants contain urushiol, the same oil found in
poison ivy, oak, and sumac. Or they may contain a substance
that is enough like to urushiol to cause a similar rash. Contact with these
plants can make you allergic to urushiol. As a result, you will get a rash upon contact with poison
ivy, oak, or sumac, even if you never had contact
with it before. These plants include:
Mangoes (the allergenic oil is in the fruit's rind and
Cashews (the allergenic oil is in the
Indian marking nut trees.
Tropical silk oaks
(sometimes grown as ornamental houseplants).
Rashes from irritant plants
Irritant plants may cause a rash where they come
into contact with the skin. Unlike
with poison ivy, oak, or sumac, you do not have to be
allergic to the plant to develop a rash. Irritant plants include:
Flower bulbs, such as hyacinth or daffodil bulbs
or tulip bulb sheaths. These can cause a reaction called daffodil itch or tulip
fingers. Tulips can cause either an irritant reaction or an allergic
Roses, rose hips, and dahlias.
nettle and spurge nettle.
Herbs such as comfrey, borage, barberry,
tansy, yarrow, garlic, and hot peppers.
of the bromeliad family, such as pineapple and Spanish
Cacti and sharp grasses.
Rashes from plants and sunlight
Certain plants have a chemical that sunlight converts into an
allergen. Some people who touch these plants and then go into the sun have an immune system reaction similar to
a poison ivy, oak, or sumac rash (allergic
contact dermatitis). The rash only develops in areas exposed to sunlight. These plants include:
Celery, parsley, parsnip, carrot, dill, and
ByHealthwise Staff Primary Medical ReviewerWilliam H. Blahd, Jr., MD, FACEP - Emergency Medicine Anne C. Poinier, MD - Internal Medicine Specialist Medical ReviewerH. Michael O'Connor, MD - Emergency Medicine Martin J. Gabica, MD - Family Medicine