<s>[INST] i have kinda lumps behind my ears not just one but often come in a pack always filled with bloody puss they don t hurt if i dont try to pop them but always had this and now im kinda worries / also i have a lump right above my butt crack it moves around if i touch it hurts when i do sit ups had it for quite a while now . i wonder if any of this had to do with cancer or if its just a reaction to greasy skin behind my ears and the lump on ly lower back is worring enough please help [/INST] Hi and welcome to HCM. Thanks for the query.This is not usual manifestation of cancer and this is the last thing to think of. it seems like this is some skin infection or subcutaneous lesion such as atheroma. you should see ent specialist for further evaluation and try not to manipulate with this. Wish you good health. Regards </s>