My Maggie & my Jordan have white chins. They both currently have some acne. Jordan's is mostly surface & I'm trying to keep it clean with peroxide. Maggie on the other hand had a large bump that opened and bled. I looked at again last night & when I touched it, it opened up again. I looked at it this morning & it did not bleed when touched, but she keeps screaming like it really hurts. Now she is a drama queen, so it could just be that she doesn't want me touching it. In July I had talked to a vet about her chin & he said to clean it with peroxide, but she had never had anything like this. I'm just wondering at what stage does the acne require a vet?