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What sti could cause hive?

Hello.
A year ago I had (unprotected oral, protected vaginal) one night stand with an unknown girl.
I remember I shaved that day so I got concerned about getting an STI.

I took an HIV autotest after 6 weeks, that resulted negative.
A few weeks later I stsrted suffering from hives (itchy skin rash, not painful, all over the body, just like thousands of mosquito bites), which I treated with antistamines. I did some tests for allergy but all came negative. Now the hive is back (milder)

Could this be symptom of another STI?
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207091 tn?1337709493
COMMUNITY LEADER
Did you ever go to the doctor when you had the rash?

We advised you back in October that no STD would cause this kind of rash.

https://www.medhelp.org/posts/STDs-STIs/Itching-on-all-body-weeks-after-intercourse/show/3073858

You tested for HIV. Did you test for syphilis? That can cause a rash, but not like the one you're describing.

An all-ver body rash sounds like an allergy. Just because you tested negative for some things doesn't mean you don't have an allergy. Allergy tests don't test for every possible allergy.

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