My 3 year old has a scabby sore under his mouth that isn't healing because he obviously keeps licking it and slobbering his food etc. It started out as a cut as he fell over at the beach and must of hit a shell, rock or something. I'm keeping it as clean as possible but how can I help heal it faster and dry it out and stop him from touching it? I tried to put a band aid on but he keeps pulling it off.