I had a horse run me into a fence post about 3 months ago. The fence post hit the inside of my lower leg it turned my leg black and it took almost my whole lower leg and it swelled up. Well it's been awhile since the injury and my leg still has some discoloring and is still sore to the touch. Should I go see a doctor or will it heal.

You should have gone to the doctor 3 months ago. Any damage that was done if any may be irresversible now.