Hi, I am 32 years old I had a leg injury month before on the of the knee area on the bone it got hit hard by a stone and there was a wound and my leg got swollen. But after applying soframycin cream and took antibiotics it got heeled. Now still it is still in swelling stage and colour of my skin is dark black and there was a slight pain also. Please advise what the darkness indicates and what remedies could be done. Please suggest your medication for knee pain.