I know that my other cat that has been around since I was 12 (whom lives with my father b/c I have grown up and moved out...kitties of my own),Missy, has a lump on the side of her throat..had it for a long time. Dad finally went to get it checked out and it isn't anything serious...but the vet gave an antibiotic that will cause it to drain. It doesn't bother her at all. Hopefully it's the same type of thing. Best wishes!