This is Dr. David
I am sorry about your stage IV anal cancer spread to the liver.
if it has spread to the liver, it could spread to your peritoneal cavity and can spread to your abdominal wall which can eat into your belly button and cause pain.
ask your doctor for a small biopsy or ultrasound of that belly button area and see if anal cancer spread there is causing the small discharge.
if so a short course of 2 weeks of radiation could help shrink the cancer before it enlarges and cause more problems.
let me know if you have other questions.
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