i had unprotected sex recently and 2 or 3 days later i had a slight pain in penis... i didnt notice any sores anything and it kinda felt like a bruise or something but everything looked normal... i tried to find a specific spot where the pain was but i couldnt...right after the pain i have to piss...is this an std or some kind of urinary tract infection or what? i also noticed that i am peeling on my penis like you would peel if you got to much sun on your back or something like that... maybe from masturbation or something like that? again cant find any sores or anything like that and i cant physically cause the pains it just seems to come and go... have i talked this into myself or should i be concerned?