If it were me, I would do two things:
1) Spot it with a 50/50 solution of ascorbic acid and water [as often as is practicable]; and
2) Ingest a Bowel Toelrance dose of ascorbioc acid every day.
This quote from Dr. Thomas Levy, M.D. may be of interest, Muscle: "I have seen many cancers now respond dramatically and/or completely resolve with IVC, sodium ascorbate powder, chronically pushed to bowel tolerance, and relatively low dose of liposome-encapsulated vitamin C (3 to 6 grams/packets daily). All these forms of vitamin C as monotherapy have achieved these dramatic results. That said, the more forms you take of vitamin C, in the highest tolerable/affordable doses, the better."
Additionally, Muscle, you may care to look at this previous post: http://curezone.com/forums/fm.asp?i=2190853#i
Best wishes to you and your father, Muscle, on a satisfactory resolution to his health situation!