National Board of Chiropractic Examiners (NBCE) Practice Test

Seborrheic dermatitis affecting the scalp is typically treated with shampoo containing which active ingredient?

1. Zinc

2. Selenium sulfide

3. Coal tar

4. Ketoconazole

The correct answer is: Zinc

Seborrheic dermatitis is a common skin condition that can affect areas of the body where there are many sebaceous (oil) glands, such as the scalp. Treatment typically involves the use of special shampoos formulated to help control symptoms. Shampoos containing active ingredients such as selenium sulfide, coal tar, and ketoconazole are more commonly recommended for treating seborrheic dermatitis on the scalp. Selenium sulfide works by reducing the number of yeast on the skin and has antifungal properties. Coal tar helps slow down the production of skin cells and reduces inflammation and itching. Ketoconazole is an antifungal that also targets the yeast that can contribute to the condition. Zinc, while beneficial for skin health and used in some formulations to address inflammation and irritation, is not the first-line treatment specifically associated with seborrheic dermatitis of the scalp. Studies and clinical practice have shown that selenium sulfide, coal tar, and ketoconazole are more effectively targeted treatments for managing this condition. Thus, while zinc may have a role in skin care, it is not the primary or most effective ingredient for treating seborrheic dermatitis.