I was diagnosed with strep at the er. given penicillin and a steroid. oxycodon for pain. should i go back to the er (see below). today my face and chest started flushing (parts are purple in tint like a bad sunburn) the initial rash on my thighs has darke

See your doctor: This could be an allergic response of some kind. All opioids may cause histamine release with reactions like flushing and hives, but what you have happening does not sound like that. I would go back to your primary care provider or to the er that treated you asap.

Strep what???: There must be more to this. "Strep" is the name of a bacterium, not a diagnosis. Strep throat? Other? Why the steroid??? Why the narcotic? These last 2 are not treatments for strep or any infection. You need a dermatologist, not another ER visit.