I Got In A Bicycle Accident Recently Where I Ended

I got in a bicycle accident recently where i ended up sliding hard into a metal sign on the side of the rd. I was going probably 20 - 25 mph when i hit my thigh very hard against this pole. It left a huge dent in my leg at first and while laying down you could hardly tell it was injured, it took a long time 1-3 daya to bruiae but now when i stand there is a huge awollen mass on my thigh. Should i worry about this?