I don't want to scare anyone but it crossed my mind this could be a tumor. It could also be a fungal infection, I suppose. Just want to think broadly so you have something to consider. If it is a tumor, I don't know what to say except that if there is no way a vet could help, you may start looking into treatment options from alternative medicine. Fungal infections, there are anti fungal OTC topical ointments, as well as herbal.