Sun allergy (or photosensitivity) is caused when the sun-exposed skin reacts abnormally to sunlight. It occurs due to reaction of the immune system on exposure to sunlight. The exact cause of why some people develop sensitivity to sunlight is not known. Sun allergy can affect any skin type, but it tends to be more common in fair skinned populations. About 5-20% of fair skinned people are affected by sun allergy. Read to know how long the effects of sun allergy last.
Read more articles on Sun Allergy Photosensitivity