My 4 year old, indoor, male, grey tabby adult cat named Miso has a big lump on the one side of his mouth (pictured) and a small lump beginning on the other side of his mouth. I began to notice a bigger lump under his chin first because he was scratching at it and then waited out for a month to see if we should bring him in. After about a month, it didn't go away so we brought him in to see the vet and he gave him a shot that he said would clear most skin irritations. He also got his shots (vaccinations) updated. Brought him home and the lump under his chin cleared up after a day and a half. About a week or so later I noticed the larger lump on the side of his mouth. He occasionally scratches at it, doesn't seem to be bothered at all when I touch it firmly, appetite is regular (perhaps with a TAD of increased drinking), going to the bathroom as normal, and nothing in his food diet has changed. I'm not convinced it's cat acne since most forums and sites say there's black spots and I don't see any. Can anyone help me figure out what this is? The vet has quoted me $500 because Miso will not let the vet touch him, so he has to be put out so that the vet can extract fluids from the lump and send it away for testing. All that costs a whopping $500!? Anyways, hoping for any help here.