I Was Kicked In The Leg Moderately Hard Yesterday And

I was kicked in the leg moderately hard yesterday and it got extremely swollen almost immediately
I could walk fine on it but the swelling made it tight and harder to walk. Today it seems the large bulb like swelling has flattened out and spread over a larger area about the size of my hand. The more I walk on it the better it feels and after periods of inactivity it hurts more. What should I do?