Yes is soft am taking him for vet visit thanks for response.Is it actually a blister...meaning it seems to have a watery center that is not really hard? It is very kind of you to help this poor cat but with the bad breath and lump it would be good if you could consult a vet. Others may reply who have some help for you.
ThxI have no idea what that might be, but just that fact that he has bad breath is enough to warrant a Vet visit. He may be badly in need of a dental.
Thats my plan...thxAny cat that has been "living wild" should be seen by a vet, ASAP. Especially with bad breath. I'm with mrsgreenjeens , he almost certainly needs a dental. Mouth infections can become systemic infections, which are much harder to treat and may, if allowed to go untreated, be fatal.