Suggest Treatment For Hard Bump On Head After Hitting

Hi my son hit his head on the corner edge of a table about 1 week ago and now he has a hard bump with crust over it and i removed it and puss with blood flowed out of the bump and a hole formed so i cleaned with hydrogen peroxide now 5 hours later the bump is back and a bloody crusty build up is there again and a little puss is leaking from the sight...should i be worried??