I have had unprotected sex before but not many times. I had unprotected sex about a month ago with a girl i trust doesnt have any type of STD. Then the following week multple nights a week i would have intense and long dry humping encounters with girls. After about a week from me having unprotected sex and the night after a very long and steamy dry hump with clothes on I woke up and had two bumps on penis. The first one i popped and it went away after a day or two. The second one i popped and on large blister formed, then it scabbed over, and now the sore is more like a rug burn. The sore never hurt, itched, had any painful urination, or anything just was uncomfortable to have. After having it for about a 1.5 weeks it went away and it is completely fine. I have had no flu or fever symptoms, muscle aches, or fatigue. The blister formed where the heair is on the penis shaft near the base. I assume it was just a friction burn or something from many dry hnping sessions and I alsp never masturbate with any lubricant which may play a factor. I live in a college house that isnt very clean and my hygiene isn't very good either with may affect what ahppened as well. When the blister did form though there were a couple tiny clear and puss filled pimples around the blister that i could pop and clear fluid would come, they werent painful and lasted a day or two. Could please someone explain what this could be. I am woried it is heroes or syphallis. I currenlty dont have any rashes or sympotms of anything else. Im hoping it is just a frictional rash or heat burn that might of gotten infected due to my poor living conditions and poor hygiene. Any help or isight would be great.