Jellyfish found in Canadian coastal waters are capable of stinging, resulting in a mild to moderate amount of pain. If you are stung by a jellyfish in Canadian coastal waters, do not use vinegar for the sting. This may make the sting worse. For information on what to do if you are stung in Canadian coastal waters, visit the British Columbia Drug and Poison Information Centre (Poison Control) website.
If you are concerned about a jellyfish sting or require further information about jellyfish and the health effects of a sting, call Poison Control at 1-800-567-8911 toll-free anywhere in British Columbia, or 604-682-5050 in Greater Vancouver.
The rash and skin irritation that occurs with minor jellyfish or Portuguese man-of-war stings will usually go away with home treatment. Seabather's eruption is a rash that develops from the stings of jellyfish or sea anemone larvae. Although these rashes are annoying, they are not a serious medical problem.
When an itchy rash occurs several days to weeks after a sting, the rash may mean a delayed skin reaction has occurred. A delayed reaction can occur many times over the course of 1 to 2 months following a sting. You may have a fever, weakness, or joint stiffness or swelling. Medical treatment may ease the discomfort and prevent complications from a delayed reaction.
Jellyfish or Portuguese man-of-war stings may cause blisters or small, shallow sores (ulcers). The skin at the site of the stings may look dusky or bluish purple. Healing may take many weeks. Permanent scars may occur at the site of a sting.
Sores usually heal without medical treatment. Wounds should be cleaned 3 times each day and covered with a thin layer of antiseptic ointment. But when a deep sore develops, you may need medical treatment to help the sore heal and prevent infection.