I Cannot Go To A Doctor. I Tripped And Fell

I cannot go to a doctor. I tripped and fell on a small sharp tree stump and got a 3 inch cut on my shin. It was as deep as it could be on my shin. I put some butterfly bandages on it and figured it would heal. It did not. It got so red and hard and painful that sometimes I could barely walk. The redness and hardness extended about 6 inches from the cut. So I put a charcoal poultice on it for two days and it improved except closer to the wound it is still red and hard and painful. So now I alternated placing it in a hot water bucket for 3 minutes and a cold water bucket for 1 minute. I put 3 cups of salt in each bucket, and when I was done doing each 3 times I put another charcoal poultice on my shin. Is there anything else I can do?