I noticed this black bump on my leg a few months ago. I reckon it's been there about a year, but it never hurt so I didn't think too much of it. However a few week ago when i touched it, it seems soft, and pus came out when i squeezed. Over the next few days I got some foul-smelling pus from it, but now the bump has raised and grown a bit. there are small bumps around it and a huge boil-like feel to it. The black dot has increased and it hurts to walk or bend my leg.