Doctor's Notes on Dandruff
Dandruff is a condition that occurs due to peeling, or exfoliation, of the skin of the scalp. This process is completely normal, and dandruff becomes a problem due to cosmetic concerns. Excessive peeling of the skin may contribute to dandruff. The most common cause of excessive scalp peeling is seborrheic dermatitis (seborrhea), an inflammatory condition of the skin thought to be related to a specific fungus type (Malassezia furfur) that lives on the skin.
Signs and symptoms of seborrhea include itching along with reddened skin plaques covered by scales. The red, scaly plaques can also occur on the eyebrows, forehead, in the ear canal, and on the skin between the nose and lips. Slowing of hair growth may be an associated symptom, but seborrhea of the scalp does not cause hair loss.
What Is the Treatment for Dandruff?
Mild dandruff may not require treatment. Moderate to severe cases of dandruff can be managed by medicated shampoos. There are a number of different medications that can be added to shampoos to control dandruff, and there are over-the-counter shampoos available as well as stronger prescription shampoos if the over-the-counter products are not effective. Self-care measures that may help include avoiding hair care products, getting some sun exposure, and paying attention to stress management.
Ringworm : Test your Medical IQ Quiz

Ringworm is caused by a fungus.
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Contact Dermatitis
Dermatitis is an inflammation of the skin. Contact dermatitis is a localized rash or irritation of the skin caused by contact with a foreign substance. Contact dermatitis treatment can include medications, such as corticosteroids and oral antihistamines, home remedies, and avoiding irritants. -
Psoriasis
Psoriasis is a common and chronic skin disorder caused by inflammation that affects 1%-2% of people in the U.S. There are several different types of psoriasis. Clinical types of psoriasis include pustular psoriasis, erythrodermic psoriasis, or guttate psoriasis. Psoriasis is typically found on the knees, elbows, lower back, and scalp. Symptoms and signs include red, raised, scaly areas on the skin that may itch or burn. Treatment may involve topical therapy, phototherapy, and medication.
REFERENCE:
Kasper, D.L., et al., eds. Harrison's Principles of Internal Medicine, 19th Ed. United States: McGraw-Hill Education, 2015.