Hello Doctor, My sister had an injury from the door/lock in which she got hurt under the finger nail. There was pain for initial 3-4 days.. now It's been almost 3 weeks and there is no pain at all but the bruise is still there.. it was green initially but then after some time turned black kind.. I wanted to know if the bruise under the finger nail requires any medical attention to go away completely or will go away with time, on its own. Please advice. Attaching the picture of it, as of now. Thank you.