For a few months I've had a small dark black/brown dot on my stomach which I assumed would go away (had something like it before) so I kind of let it be. It was flat for the most part. The last week or so the bump started to raise a bit, and now today I found it to be red, like acne. For the most part it is red, the middle being a bit darker like how it was when it was just a spot. It does hurt when I push down or rub it (not substantial pain, just like how acne would feel). I can't really tell the size, a bit smaller than a dime. Attached is a pic I took of how it looks like (just the bump, nothing else!). I'm thinking it might be acne but I wanted to see what people on here would think.