My nephew has a severe dandruff problem. treatment?

Seb derm & dandruff: Mild seborrheic dermatitis and dandruff can essentially appear the same, but seb derm is often associated with redness, scaling, and crusting. Seborrhea also can affect other parts of the body, including the face, chest and upper back. Many over the counter shampoos are available for both conditions, and your pharmacist can help.