I have very sensitive skin and i have little red dots all over my backside, they don't hurt. One night, I came home from work, and sat down and felt slight pain and tightness on my left butt check. I went to get a look and it looks like either a bite or something else. I put cetaphil on it and it feels a little better but doesn't last for long. I don't know what it is and I don't know if it'll be a big deal to go to the doctor for.