My dog has sores on her chin

Question
My 2 year old boxer has some sores on her chin. They are red and hard.
She was wrestling with my sister's Boston terrier about two weeks ago and hit her lip and she got a fat lip. It still is trying to heal.
I was just wondering if that has anything to do with the sores and what could the bumps be?

Answer
It could be several things., could be a staph infection from the original wound. Or it could  be an allergy. Take him to the vet to find out for sure. Make sure you don't feed him in plastic containers. Believe or not, there are breeds of dogs like pugs and boxers who have allergic reactions to plastic and need to eat out of stainless steel or glass.
Hope you find this helpful
Cindi