I'm not 100% positive, but I think I have cancer. I tried looking for it on the web and can't find nothing about it. Heres my problem..A little while ago I got this lump on the lower part of my back, basically right at the top of my buttcrack. I figured it must of been like a pimple or something, so I let it go. Well..it really never disappear and got huge. It's probably the size of a half dollar now and I think it might cancer but not sure. The reason im not sure about it being cancer is, I already popped it once and blood and puss comes out, but it came back a couple weeks later. Does anybody have any clue what it might be? Please any help is much appreciated!