Hi Okay - 9 days ago I had a casual encounter in the sauna with another guy. No oral, no anal. I did put my penis head on his anus a few times. On day 5/6 I noticed that after I urinate, there was some discomfort - no burning during the stream, but discomfort about half an inch below the head in the penile shaft. Now I see a little scab under the ridge of my penis head. It s not round, but linear, like there was a little cut or something..... After rechecking, it just fell off. There s no opening on the skin though... I went and got tested today - but a little worried... What could this be?