Could be abscess related to dental so I would make vet appointment in case antiobiotic needed.Feline acne, dab with hydrogen peroxide, make vet appointment, you may need antibiotic. Do not use plastic bowls only use ceramic and shallow dishes. Paper plates ok and throw away each time or if using ceramic, switch out and wash each time. Plastic harbors bacteria.
Feline acne does reoccur.Thanks guy, she has had feline acne before and we did change all her dishes so I don't think that's it, whatever it is it seems to be healing on it's own- lucky us!
thanks again