Methylpred DP and acne

how long till one week of this stuff is out of your body, i have acne after i have been off of it for one week. i am 42 and havent had this since in my late 20's. also i have gained weight and i am hardly eating anything & work out. PLEASE let me know how long to expect this to continue feel bloated mostly my tummy area but also my legs. very tired also. thank you

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.