Suggest Treatment For Swollen And Bruise Buttocks After Injury

I was out in a storm, trying to save our pool. When the pool folded up like a taco and the wind took me and the pool into a 6inch across beem. I hit across the entire left butt cheek. By the next morning it was swollen and bruised, that lasted for 2/3 weeks. It s almost been 4 weeks and there is hard bumps when you push on it, and my part of my butt cheek has no feeling normal or should I be worried? Thanks #learned my lesson about storms