Or more specifically, seborrheic dermatitis, which is considered ... In very rare cases, an itchy scalp can be a sign of lymphoma, Dr. Haley says, specifically, a form called “Cutaneous T ...

Experts believe seborrheic dermatitis may relate to an overgrowth of Malassezia yeast on the scalp. Shampoos with antifungal agents like ketoconazole, selenium sulfide, and zinc pyrithione can help.