I have this rash on my buttcheek. Only my left one. I've been to the doctor about it, and he gave me some medication which cleared it up, but once I stopped taking the medication, it came right back. He said he didn't think it was an STD. Some of it looks like acne, but it's very painful and sometimes bleeds. They kind of look like mosquito bites but they don't itch, and some of them are just red dots. I noticed this a few months ago and I have no idea what it is.
Do you have any idea?