Dear Becky,

It sounds as if you have a sun sensitivity condition known as polymorphous light eruption, sometimes known as PMLE for short. Polymorphous light eruption is harmless but it can be a nuisance due to the itching and the appearance of the rash. Itching red bumps usually appear within a day of intense exposure to the sun's ultraviolet rays - usually UVA, which can pass through glass - most often on the front of your neck, the backs of your hands and your chest, arms and thighs. Some people can develop blisters and experience stinging or burning.

Polymorphous light eruption usually resolves without medical treatment within a week or two. I suggest you consult a board certified dermatologist if the rash is extensive or painful, if you develop blisters or fever or if it doesn't resolve within a couple fo weeks. Your dermatologist can confirm whether this is polymorphous light eruption or whether you should be avaulated for other sun sensitivity conditions, some of which have internal causes. You should also see a dermatologist if you suspect the rash is related to any medications you are taking which are making you mroe sensitive to the sun, such as the painkiller, ibuprofen (Motrin) or the diuretic, Lasix.

Cortisone creams are helpful; I like to prescribe Locoid lipocream, which rehydrates the skin in addition to brigning down inflammation, for a quick response. You can also try antihistamines such as Zyrtec and Claritin, which are available over the counter. Cold compresses are soothing. You can prevent or minimize polymorphous light eruption by gradually increasing your sun exposure times in the spring and avoiding intense sun exposure, by wearing sunscreen and protective clothing. I do not recommend a tanning bed as the risks of skin cancer and premature aging outweigh the benefit of any temporary improvement in the rash.

Good luck!

Dr. Hema