For a couple months now, I've noticed I occasionally have small bumps around my anus. They are near the back of my vagina, on the inside of my left butt cheeck. I have nothing on the right side. There is maybe one bigger bump (the size of a pencil's eraser) surrounded by two or three smaller ones and is the color of my skin. It looks like a small swollen mosquito bite when I scratch it. It has no fluid/pus in it; it hurts and kind of stings when I touch it. These pimples kind of feel like a rash; they hurt when I touch them. It doesn't hurt to sit or stand or walk. They go away for around a month, and come back. Maybe it's sweat that's making me get the rash? Or an std? Any help would be great. Thanks.
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