get him to a dermatologist.
i was born was psoriasis, and grew up with a scalp covered in thick scaly patches.
things that have worked: medicated creams (amcinonide
, which helps more with the redness and irritation, and dovonex
, which helps with the dryness and scales), and moisturizers. for the scalp and face, i'd recommend some kind of oil, either jojoba or almond. and don't pick at it!