Cat with growth under his armpit

[Guest guest]

Vet says it isn't cancerous at the moment but could develop into something nasty

if it's not treated because it's growing. Trouble is, cat's immune system is

severely compromised (his mother was a feral and mated with her father - I

adopted the offspring because they were both pretty messed up). Therefore

operations et al are dangerous for him. Has anyone any information on tagamet

and DMSO and/or baking soda used topically for animals or any other suggestions

that I could administer easily to a semi-wild animal? His brother has already

died because his digestive system shut down so I'd truly like to give the

surviving cat the best chance I can. He's nearly 2 years old. Thank you.