What is the best way to treat severe dandruff?
Q. I have had a dandruff problem for years. I have tried selenium and zinc shampoos, as well as ketoconazole shampoo. Nothing has worked. Are there other options?
A. Dandruff, which is a chronic skin condition known as seborrheic dermatitis of the scalp, can range from a minor irritant to a severe rash of the entire scalp.