Strange discoloration around the corner of my piggy's mouth, can anyone advise? It appeared the other night and it doesn't wash off. She isn't acting any differently, still playing and snuggling as she usually does. I called my vet but she still hasn't gotten back to me and I'm getting scared.

Strange discoloration around the corner of my piggy's mouth, can anyone advise? It appeared the other night and it doesn't wash off. She isn't acting any differently, still playing and snuggling as she usually does. I called my vet but she still hasn't gotten back to me and I'm getting scared. oink!