My father got a boil about a week back which is not healing at all. Applied Betadine after that wound looks dry but after a while it turns watery with a white head and yellow pus is coming out, on removal of the puss there is blood and it looks like an incision is made (small hole like from where blood is coming out) Blood is not stopping. The blood itself is turning into puss on drying. What medicine should be taken for this? This boil is on the waist region.