DS has had a mark on his foot for a couple of months - tbh I thought it was a shoe/ sock rubbing thing and that it would go in time. It's about the size of a 2p piece, not hard, only v.slightly a different colour to the rest of his skin and doesn't hurt or irritate him in any way. But as it isn't going I think we have to take him to the Doctors I think just to make sure it's nothing. But anybody had this.. Any ideas..?