I am slip on stairs in last sundy and i got this bumps on my back

A. I think you just got because you have got hurt for the more if you got swelling and all also then in that case you should get it checked with your doctor but as far as I can see in the picture this is going to settle down over the period on its own only yet if you would want to apply anything you can go ahead with apply Iodex or move onto this area