Hi, I am 21 old male, my legs and arms starts itching after i masturbate. I noticed this problem about a week ago. First time it happend i thought it was an allergy because of something I ate, therefore I took an anti-histamine (xyzal), put cold water on the itchy parts, and slept due to tiredness. The second time I noticed that masturbation is the cause of this itch, I took the same anti-histamine, took a shower (recommended in a comment on the internet for a guy with a similar problem), the itch vanished but I m still unsure if it ia because of the anti-histamine or the shower (and the cold water in the first time). Surprisingly my girlfriend gave me a blowjob and I didn t get an itch at all, so i thought that my problem is over, but today I masturbated and I got the itch again. So i started searching the net, and I found a previous post on this site where the doctor suggested checking the thyroide, b12 levels, and seeing a psychiatrist. Is that what I need to do ? Or does my cas differ ? Should I be worried ? Thanks.