My 23 yo son has a rash on his groin , hips, back, stomach and bends of his knees...he describes the itch as a feeling of fiberglass insulation on his skin, he also has a sore throat (for 3 days), he is a user of meth and I am trying to figure out if this is related and there is any treatment if this is caused from drug use? He has been taking benadryl and soaking in baking soda bath