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I looked at the pic and thought it looked like ringworm myself. I had ringworm on my arm before, and yours looks almost exactly the same. Then I looked up ringworm and found that a ringworm infection on the groin is called jock itch, which has already been said. Lol, learn something new every day.View attachment 209384 i have a rash on the bottom of the under side of my penis i have had it since i was prolly 13 or 14 and im 20 now it doesnt really bother me unless im really hot it starts to itch a little and sweat here is a pic of it