I Had An Injury About A Month And An Half

i had an injury about a month and an half ago by slamming weight on the underside of my finger. I had a blood blister that reopened and drained after that i cleaned it everyday with h2o2 but it never fully healed. recently i was working and the blood blister reformed. I once again cleaned it, but the skin grew over it and there is discoloration under my skin. now i am seeing swelling and right before my finger nail i am seeing a green swell.