Methylpred DP and rash on

I was precribed this medication for lower back pain that went down my leg. I took it for one day (6) tablets as precribed. I had trouble sleeping that night, but thought it was stress related, but I now find other people had this problem. Also, the next morning I took the one tablet as prescribed and broke out in a rash on my face, neck and chest, plus I had feelings of needles in my arms and was hot all over similar to hot flashes. I will not take any more.

My son took Methylprednisolone pack for 2 weeks, from having 4 wisedom teeth extracted. It has now been a month. His face is swollen and also has severe rash on his chest, back and shoulders.
At the same time he has been taking sulfamethoxazole and Hydrocodone for pain. But take the antibiotic ampicillin for his acne prescribed by his dermatologist.