I've had the same type of swelling and whatnot on the side of my glute close to the hip bone, super bad to where i would be in agony if it was hit or i rolled on it in bed, it'll go away in like 3-6 days, each day will get better, but that's just my opinion, if it's not super hot, you're not running more than a 100 fever, or redness spreading take 3-4 ibuprofen & restup (besides going to the gym)