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As far as I know, it is possible to be allergic to anything! I do know that there are people who are allergic to water or sunlight. It's just very rare.
Quote from: Carol-A on 29/11/2007 17:28:27As far as I know, it is possible to be allergic to anything! I do know that there are people who are allergic to water or sunlight. It's just very rare.Are these technically allergies? I know people can react against sunlight, but I would not have thought it was an immune response, which was what I thought an allergy was?
Polymorphous light eruption (PLE), or polymorphic light eruption, is a skin complaint caused by sunlight. Symptoms include skin irritations, which may be itchy or painful, and are sometimes confused with hives. These irritations appear upon exposure to sunlight—sometimes as little as 15 minutes of exposure to the sun can bring onset of the condition—and may last from 1 to 7 days. Generally, PLE resolves without treatment; also, PLE irritations generally leave no scar. The cases of this condition are most common between the spring and autumn months in the northern hemisphere.Typically, 10-20% of the population are affected and it is more common in females than in males. The condition can affect all ethnic groups and research suggests that 20% of patients have a family history of the complaint. Those suffering from PMLE usually do so by age 30.The cause of PLE is not yet understood. It is thought to be due to a type IV delayed-type hypersensitivity reaction.
Allergy is a disorder of the immune system that is often called atopy. Allergic reactions occur to environmental substances known as allergens; these reactions are acquired, predictable and rapid. Strictly, allergy is one of five forms of hypersensitivity and is called type I (or immediate) hypersensitivity.