15 days after HT, bumped my head and got small swelling on head after 2 days swelling started at other place, advice?

It was minimal hit on head I can see two grafts were damaged with blood clotting at roots and small swelling at that area. More over it was same day of my travel(India to USA). After coming to USA from 2nd day small multiple swelling start across transplanted area and keep on increasing. One of them busted pus came out of it, I Bumped exactly at middle these bubbles start below that spot but not at exact spot. -What should I need to do and whom I need to consult? Thank you