<s>[INST] Hello I am a 21 year old male and have a solid under the skin lump on my left anus cheek about the size of a kidney bean. I don t have any pain at the moment and there is no head for it to be any kind of spot. About 3 years ago I had a pilonidal abscess above my anus hole if this helps. [/INST] Hi.Painless lump at the buttock cheek, about the size of a kidney beam is suggestive of wither a Sebaceous cyst or a Lipoma. It is better to get this removed (excised) for 2 reasons.1> your get rid of the disease and 2> you get the histopathological diagnosis- makes you tension-free that it is not a cancer. </s>