9 Days Ago I Bumped My Thigh On A Wooden

9 days ago I bumped my thigh on a wooden object. It was a very hard impact. My thigh was sore for the first 4-5 days but nothing serious.I had a little difficulty walking but could manage. I figured that I had a soft tissue would. The last 3-4 nights the discomfort/pain had made it difficult for me to sleep. A few hours ago, my lower thigh and knee has become black and blue. I can still move my leg freely but I am now concerned with this new development.
I find it curious since it is about 5-6 inches south from where the impact on my thigh was
What would you advise?
Thank you