[WonderWhat]

Ignoring the fact that doing it bareback is an invitation to get infected...

What you've got is a fungal infection: Go See A Dermatologist. Get a cream prescribed, put it on twice a day after washing the lesion with a mild, neutral pH, non-perfumed soap and air-drying the area thoroughly before putting on the cream.

I've had it a few times, especially after using latex-safe lubricants several days in a row. Those usually have glycol or glycerine, which is great food for fungi (which is just why cornstarch is not a good idea for these kinds of lesions).

The first time it happenned, I just thought that I had irritated my glans by having too much sex, and it cleared after about three weeks of good hygene, no sex and zinc-peroxide cream. (With the anti-fungal cream it clears up in about four days.)

Now I know that there's no such thing as "too much sex", and that you just have to wash off all the lube before going to sleep. I always keep non-scented moist wipes handy for that.

There are a few "for women" latex-safe lubes that have less glycerine to avoid vaginal fungal infections: it's easy to wipe off lube externally, internally it's not so easy.