Hello,
I cannot confirm a diagnosis without examination,but it can be generalized pustular psoriasis.
Psoriasis is a chronic, non-contagious autoimmune disease which affects the skin and joints. It commonly causes red scaly patches to appear on the skin.Diagnosed by skin biopsy and phototherapy(PUVA )is helpful in treatment.
Hope it helps.Take care and pls do keep me posted on how your friend is doing or if you have any additional queries.Warm regards.
Possibly AirBorneContactDermatitis ABCD,and he may need anti histaminics and steroids when indicated.