What is the hard lump at the top of his butt crack?
Patient: My husband has stage 4 rectal cancer.   He had bladder cancer 20 years ago.  He has a hard lump at the top of his butt crack and has extreme pain in his rectum. He does have an infection and is on antibotics.  Could this hard lump be another cancer? Doctor: Hello!Thank you for the query.No, this lump is rather not a cancer. However it might be caused by a rectal cancer. Especially if there is a fistula caused by such cancer. The other possibility is that he has pilonidal cyst which has gotten infected. Due to ingrown hair in the butt crack area tissues get irritated and infected. This leads to an abscess formation.For sure he should visit a general surgeon with this problem.Hope this will help. Regards.