The best shampoos to treat seborrhea include Nizoral A-D anti-dandruff shampoo with ketoconazole and Head and Shoulders with selenium sulfide or pyrethione zinc, according to About.com. Shampoos containing coal tar or salicylic acid can also treat seborrhea.
The active ingredients in dandruff shampoos help inhibit the growth of a type of yeast on the skin that is thought to play a role in seborrhea, or seborrheic dermatitis, reports the American Academy of Physicians. Though everyone has this yeast, only some people develop the greasy flakes and scales of the disorder. Sunlight also prevents the yeast from growing. Severe seborrhea is treated with prescription corticosteroids.