So one of my cats that was a bottle baby a long with his brother has recently developed some type of sores under his chin. His brother had it recently as well. I'm not sure if it's from the two brothers playing too rough, getting not or stung by bugs (They are a mischievous duo), acne, or even ringworm? A vet today said maybe ringworm, but she didn't seem sure of anything really and said they'd have to do a $300 culture to rule it out?. Anyone here have any ideas? I'll attach a picture of his chin as well.