hi I've had this rash that start off w/one red bump that looked like an insect bite......rash has now spread to upper body mainly chest,back and arms a few red spots on upper thighs and lower stomach and spreading. It looks like a combination of heat rash and hives but the skin around red spits are starting to scale over and it's. Extremely itchy! Went to urgent care they scraped the red spots determined it was not fungal now I'm experiencing a warm burning sensation in upper body and my feet are swelling I should add also I recently had arthroscopic surgery in my right knee which has been consitantly swollen now 6 weeks after surgery. Is this all related somehow?