I have a red circle appear on my penis glans, sometimes it comes and goes....it doesn't hurt, it has a very, very slight indentation. Like I say, it's there every day, but not visible fully all of the time. I bought a thrush cream thinking it could be that, but it hasn't done anything to help it.
I have only had mutual masturbation as a sexual activity. No oral or penetrative sex at all.
Any ideas as to what this could be?