Ten Days After A Fall, On Concrete, Which Caused A

Ten days after a fall, on concrete, which caused a broken lip (bitten), scrapes on my nose,lip, and chin, and bleeding scrape on my left wrist, all of which are about healed, I have found the left side of my abdomen very sore over the last week, around my waist. I have two sores on the left middle abdomen, and have discovered several red, raised bumps, about aspirin sized, like a light rash. I suspect I did a belly flop toward that side - I am obese, 250# - and that the tenderness on that side is bruising, exacerbated by pants waistbands. There is no rigidity when I press in that area, and my eating and elimination are normal. Should I be concerned about the tenderness, or expect it to gradually go away?