I know this sounds disgusting, but can someone tell me what this bump on my back is? It's been there for years, and has changed size, in both directions. Once in a great while (Years), it will ooze a white puss like substance, and man that stuff really smells! The smell as best as I can describe it, is a combination of dirty ass, and really dirty feet! . I know it's gross, but does someone know what this is?
Thanks in advance
http://en.wikipedia.org/wiki/Cyst