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I’ve noticed some red marks on the end of my penis. They dry up and become scabby after a while...what could they be?

I’ve been having unprotected sex with an ex-girlfriend. Since then, I have developed red marks on the end of my penis which dry up and become scabby after a while. They have been there for a month now, and I show no sign of breaking out of the spot-scab-spot cycle. Recently, one also appeared on my scrotum. I also have experienced severe itching and an intense, prickly rash. This began on my penis (it felt sort of 'inside') but has since spread to cover various areas of my whole body...small, hardly visible dots on my hands, arms, buttocks, etc. My ex had contact with another man who apparently had the same itchiness. Any idea what I might have? Are the two things (the blistering and the rash) related? Please help!