Thanks ladies. The rash went away right after he took the medicine, but we're keeping our distance for a few more days just to be on the safe side. As for what may have caused that kind of allergic reaction, we have no idea! We spent over an hour at the clinic going over what it might have been. They asked every question imaginable and he's not come in contact with anything new in the past few days, no outside work, no new clothes, no new food, no new dryer sheets or hygiene products...it's a mystery!
The medication makes him "euphoric" though which is quite funny. He laughs constantly for about 30 minutes before he gets back to normal.