He is 4 months old, and it looks almost like a bruise, or that he has bitten it, but he has no teeth! I noticed it this morning. He has been very dribbly for weeks now so has been chewing everything and anything but I haven't noticed him hurt himself iyswim. It is on the right hand tip of his tongue and is about the size of a 5 pence piece. Is it worth a trip to the walk in centre in the morning?