I am a gay male and I have itchiness and burning feeling in my anus and penis. The tip of my penis is a bit dry as well. I have been tested for std and all came negative. I am wondering what else it can be? No rash, no redness, no blisters at the present moment. This all started after I had a sexual encounter, kissing, making out, touching, skin to skin contact and some brief oral sex (performed by me on him). There was not penetration. Can you please help me? I am stressing out.