I am having pain in my back like I'm passing a kidney stone, in the 13th I spent hours in pain in the bathroom floor in the fetal position. The floor was cold and some what helped in between me throwing up and sweats from pain. My wife made me go I to the ER , they did a cat scan said it was a kidney stone a d I was passing it. Gave me Percocet, zophan and naproxen after I got home after so.e rest my wife went and picked my medicine up and yesterday I noticed a red bump like on the site of where my pain is coming from! What could this be? Should I be worried? Why have I not passed The stone if I really have one?