Psoriasis is a chronic autoimmune skin condition that causes a red, scaly rash, most common on the elbows, knees, hands, back, and scalp. “Because psoriasis is a chronic inflammatory disease, many patients seek alternative treatments and lifestyle changes to complement their treatment and relieve symptoms. Salmon, tuna and other fish oils are the best ingredients to include in your diet for scalp psoriasis. For breakfast, we recommend soft cheese, cereal and whole grain bread with beans and many other things included in our diet plan.