3 Days Ago I Was Splitting Wood And A Piece

3 days ago I was splitting wood and a piece shot out and shot into my shin. I used the frozen peas for 30 mins and that was great. Now the bruise is coming visible and it is sore with burning and feels swollen, all day it has been itchy (but haven't rubbed it) and as I was in the forest collecting kindling for a few hours I ignored it, but now on the couch with leg raised its really burning. Can you help please?
Kind Regards
Tania