Aa
Aa
A
A
A
Close
Avatar universal

Non-itch splotches from sun exposure

When it's really hot outside and I spend a lot of time in the sun, such as tanning, I develop these red splotches all over my thighs and arms. Sometimes they even appear on the lower part of my legs, but not normally. It takes about an hour for it to go away as my skin cools down from the heat. Other people in my family do not have this problem. My mom thinks it's a mild allergic reaction to the sun. I was wondering if you can give me any information as to what it might be; and, if a dermatologist can give me something to make the ugly red spots disappear so when I am out in the sun for an extended period of time, I do not have to worry about it.
2 Responses
Sort by: Helpful Oldest Newest
Avatar universal
Hi,
I have a similar response to sun and heat, but the rash is not itchy or burning, its just the physical red/ splotchyness that I get.
Is that still an allergic reaction? Should I treat it or just ignore it? (it does not affect my in any way other than turning my limbs red)
Helpful - 0
Avatar universal
Hi,
THis is an allergic reaction to the sun, a form of physical allergy.Cholinergic urticaria is a subcategory of physical urticaria (aka hives) that is a skin rash brought on by a hypersensitive reaction to body heat.

Symptoms follow any stimulus to sweat such as exercise (sometimes called exercise-induced urticaria), heat from the sun (which could also indicate solar urticaria), saunas, hot showers (reaction to water can also indicate water urticaria).

The affected area will often feel warm and can be extremely itchy or exhibit a burning sensation. Typically the rash occurs on the upper trunk and the arms but can appear on other parts of the body.

Applying cold water or an ice pack to the skin can abort an attack.Treatment is  in the form of antihistamines such as loratadine (Claritin), hydroxyzine, cetirizine.
Calamine lotion can be applied on the areas of rash.

Since this is an allergic tendency on your part you cannot stay out in the sun for too long. You will have to avoid it to prevent these outbreaks.
ref:http://en.wikipedia.org/wiki/Cholinergic_urticaria
Helpful - 0
Have an Answer?

You are reading content posted in the Dermatology Community

Top Dermatology Answerers
Learn About Top Answerers
Didn't find the answer you were looking for?
Ask a question
Popular Resources
Learn to identify and prevent bites from summer’s most common pests.
Doctors argue for legislation to curb this dangerous teen trend in the latest Missouri Medicine report.
10 ways to keep your skin healthy all winter long
How to get rid of lumpy fat on your arms, hips, thighs and bottom
Diet “do’s” and “don’ts” for healthy, radiant skin.
Images of rashes caused by common skin conditions