Nodular melanoma

My father has nodular melanoma on his head. It’s bleeding and is huge about 7 cm circuitry and about 25mm raised on his left side of his head. It can’t be removed anymore due his age 89 years. So what’s best to treat him . He his bleeding and smells as well. He says he is not sore which I’m wondering why not . 
has anyone also had a huge melanoma and feel and preparing for the next stage ,…