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Mount Vernon, IL
A 23-year-old female asked:

I had unprotected sex with a guy about six years ago and he didn't cum inside me but ony stomach and i got a rash there i can't remember how long after that. but now i break out in this itch and hiives whenever i get i'm heat and take hot showers or any

3 doctor answers7 doctors weighed in
Dr. Jeff Livingston
Obstetrics and Gynecology 22 years experience
Not related: I can not think of any reason where the exposure to semen would lead to this kind of reaction 6 years later. On the other hand you should not be getting a rash and hives when exposed to heat. I will refer this question to dermatology and allergy and maybe someone from that specialty will weigh in.
Dr. Steven Machtinger
Allergy and Immunology 44 years experience
Cholinergic hives: Thanks dr. Livingston. Hives that occur when you get hot, sweat or take a hot shower are called cholinergic urticaria, a form of physical urticaria. Other causes of physical urticaria include pressure, release of pressure, vibration, cold, and sun. Hopefully you are not still having unprotected intercourse & you have been tested for all sexually-transmitted diseases. But the hives are unrelated.
Dr. Jeff Livingston
Obstetrics and Gynecology 22 years experience
Very interesting Dr. Machtinger. What can be done for cholinergic urticaria?
Sep 16, 2012
Dr. Steven Machtinger
Allergy and Immunology 44 years experience
Provided original answer
Prophylactic antihistamines. Cholinergic urticaria can be tough to treat. In difficult case I have used cyproheptadine and gabapentin in combination. Not my usual prescriptions by any means. Obvously air conditioning, not exercising in hot weather and taking cooler showers all have their role.
Sep 16, 2012
Dr. John Despain
Dermatology 37 years experience
Not related: I don't see how this could be related to the sex. You may have urticaria now, many causes. Sort through it with a dermatologist.

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Last updated Mar 1, 2014

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