I think it's an abcess, I'm not sure though. What do you think and what do you think I should do? It's a welsummer and it acts just fine so far. I got them wed. and saw this just a minute ago. It is not on it's vent just in case you can't tell fromthe pic. It's about a quarter inch below I guess. This is after I gently washed it off with a rag and water.