To treat seborrheic dermatitis in adults, there are several options to consider. These may include products containing pyrithione zinc, selenium sulfide, or ketoconazole. Other options can include coal tar products like Neutrogena T-Gel or Sebcur, or corticosteroids if there is inflammation and itching. It is important to consult with a healthcare professional to determine the best treatment based on individual factors such as symptoms, affected areas, and previous treatments attempted. Additionally, dermatological products like Kertyol shampoo from Ducray can also be used as a complementary treatment.