What's the best shampoo for scalp psoriasis?

Many types..: Zinc pyrithione based shampoos work well, as tar shampoos (neutrogena), as dose selsun blue and its copies. Also, there are shampoos or scalp lotions that contain salicylic acid, which has a "keratolytic" effect on scales and lifts them off. Finally, local steroids can he also be injected.Pl problem areas, which can.

Systemic problem: The shampoo is treating the symptom. Seek ot treatment to deal with the cause of the problem.