Hair-washing routines may be contributing to itchy scalps, and certain shampoos and treatments are being recommended to help relieve symptoms of scalp psoriasis and dry, itchy, or flaky scalps. Various outlets have identified effective hair-washing tips and top-rated shampoos for psoriasis and dandruff relief. Dermatologists are also offering tips for managing severe psoriasis flare-ups and soothing itchy, flaky scalps.