Hi my 15 year old son’s finger has swollen up around the knuckle area. He’s had no injury to it and we have no idea what it could be. He said it was sore this morning but now the pain has mostly went. Now though it’s feeling hot though and is very swollen. The skin isn’t broken or anything and there’s no sign of infection. Any advice would be much appreciated as I’m worrying about it but obviously need to wait till the morning before I can get it checked by a go if need be. Thanks