Scalp psoriasis is a relatively common disorder that can cause a buildup of extra cells on the skin’s surface. This may result in swollen, reddish-silver patches on the scalp, face, and neck. And these skin patches are often dry, itchy, and painful. This skin disease happens when the immune system sends faulty signals and skin cells grow too quickly. One way to help improve the appearance of scalp psoriasis is to use topical medications. However, a specialized scalp psoriasis shampoo is also a good option for minimizing symptoms.