While away on vacation in India (6 months ago), I had sex with a girl I met up with while drinking, I couldn't remember anything really from the night before. I got tested 2 1/2 months later and it came back negative, I've been relatively healthy since. However, everytime something happens I still get a bit freaked out, yesterday I noticed a purple spot about the diameter of a pencil midway up the shaft of my penis, it just appeared within the course of a day. It looks alot like a burst blood vessel under the skin, its not raised and the skin itself is intact but I can't help thinking its Karposi sarcoma. Am I just being irrational?