I have this red lump about the size of a nickel or a little bigger on the right side of my butt, where my crack is. I noticed from last that it has gotten a lot bigger and is hurting a lot more then it did yesterday. I don t know if it could be a spider bite or from my underwear rubbing, which i do wear thongs, but I am starting to get concerned. I tried to get it to pop but it just seems as though a clear liquid comes out but when I tried to pop it, it just got hard. I have experienced red bumps before but not where this one is, but more-so on my butt cheek. I just figured they were ingrown hairs or something and they don t usually hurt and they have never gotten this big or red. I just wanted to know if I need to go see a doctor or what can be causing this. There are brown recluse and black widows around my part of the country.