Hello. Thank you for writing to us at healthcaremagic Your concern is absolutely genuine. Scalp Psoriasis is commonly mistaken for dandruff. Dandruff, if excessive and not responding as expected to OTC antidandruff shampoo may be more than just dandruff. Psoriasis of scalp usually presents as a deep red, scaly and itchy patches, commonly affecting the hair line. Scaling is grey white Or candle wax type. There may be patches of psoriasis elsewhere on the body as evidence in support of scalp psoriasis. The patches in psoriasis are well defined unlike in dandruff in which there may be just ill defined, dull red areas with greasy scaling. I suggest that you make him visit a dermatologist for a confirmatory diagnosis as well as appropriate prescription. In case of any doubt regarding the diagnosis of psoriasis, your dermatologist may take a skin biopsy and send it to laboratory for histopathological confirmation. Regards