So I was proscribed Tylenol #3 and naproxen how can you tell if your alergict to something.. I just…

So I was proscribed Tylenol #3 and naproxen how can you tell if your alergict to something.. I just saw my skin was all blotchy all over my boobs belly arms and thighs and skin is tight around my mouth and chin. As if there was stuff on my face.. I've never had an issue like this before.. so idk what it is