Hello! I just read your concerns. Cancers generally when in advance stages are like ulcers, the do not heal at all since they continuously multiply nonstop-- they bleed, infect, and smells bad. If I am the treating surgeon, usually in this type of cases I clean it daily using saline solution, hydrogen peroxide to chemically debride the tissues, the flush again with saline solution, followed by povidone iodine powder or spray, and top it with moist dressing. If infection is overt, I start antibacterials orally or intravenously. If persistently bleeding, I refer patients to a radiation oncologist to give palliative radiation to the tumor in order for it to dry up. Another option is refer to an interventional radiologist, if the feeding vessel of the tumor can be located. It will help in the bleeding problem by trying to embolize the vessel supplying the tumor. I hope your dad s situation will improve soon.