You should have that red bump looked at, it could be nothing but then again it is possible that you have a bad placement which has gone through a blood vessel and that red bump is actually blood getting stuck there. So definitely see a doctor or at least a good piercer about it.as for the swimming, definitely no, the chlorine and other chemicals in a pool will irritate your wound.if there are no chemicals in the water then the chances are there are bundles of germs that could cause infection.