I Injured My Shin This Past Saturday Playing Football. Someone

I injured my shin this past Saturday playing football. Someone hit their knee into my front shin and it amassed a hugh swollen bump the following day (sunday). I didn't put any pressure on it sunday and stayed in the entire day. Monday came and I had work (on my feet most of the day). By the end of the day my knee was still swollen and the swelling moved down to my ankle. Tuesday came and the bruising and swelling still stretched from my shin (right below the knee) to my ankle and began turning yellow-ish Tuesday night. My leg is still swollen and still yellow-ish. Please help!