I am suffering from hives from the past 6 months. Local doctors said it's because of some allergy. But i'm also in doubt that if it is because of some sti because I do sex and oral sex with my girlfriend. Is there some kind of sti causing hives or its just an allergy? Body is itching when having hives severely and get rashes anywhere on body from head to leg. Please tell me what is can be, is it because of sti or allergies. My gf is extremely healthy I think and also I was before this conditions. Im very confused what it can be? I take levocetirizine for itchiness relief. After taking tablet it goes away and itchiness stops and rashes disappear ,but after 2 days again it starts.