Marley has a dark sore, what appears to be a scab, on the side of his mouth on his bottom lip. I have been keeping an eye on it but it doesn't seem to be healing. Maybe because of where it is?? It is on his bottom lip, right in the middle. It did have a scab on it but that has fallen off and now it is just a dark spot. I have no idea how he got it, or what it is really. I might be able to post a pic later tonight when I get home. Is there anything I should be doing for it? Any kind of medicine that might help it heal? How long should I wait to have it looked at if it isn't healing. It looks like he has a bit of dirt on him, but it's not dirt??