Hello, I am a 31 year old male. 16 days ago I received unprotected oral sex. 3 day after the encounter I noticed some redness on my scrotum, the base of my shaft, and around my anus (and the area between my butt and genitals). Just for your information I have been tested and received negative test results for Gonorrhea, chlamydia, HIV, and Syphilis (tested 7 days after exposure). I am sure this isn't herpes since I have hsv1 on my mouth (I know what it looks like) and I have no blisters/sores anywhere in the rash. At the on set I did feel as if I was peeing more frequently and had the urge to pee more frequently (lasted about 3 to 4 days at the on set of the rash). Inhave also used Nix cream in case it was Crabs or scabies (did not help). I am alternating applying monostat and butt paste but there doesnt seem to be much improvement. The best I can describe is that it's a general redness on my testicles, perineum, and anus. What could this be?