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Case A 20-year-old Caucasian woman presents to the hospital with a 2-month history of itchiness of her scalp. On examination you note greasy yellowish scales on her scalp and eyebrows. Question What is the most likely diagnosis? A) Hand eczema B) Seborrheic dermatitis C) Atopic dermatitis D) Nummular dermatitis E) Pompholyx - Correct answer: Seborrheic dermatitis Explanation This patient most probably has seborrheic dermatitis. Itis characterized by greasy scales over the scalp. It may also be visible along the hairline, on the eyebrows, in the external auditory canals, in the nasolabial folds, and over the sternum. There may be some pruritus. Hand eczema is characterized by erythema, dryness, cracking, and edema of the skin of the hands. It is a chronic condition, which is aggravated by frequent immersion of hands in water and detergents. Atopic dermatitis is characterized by chronic pruritic lesions marked by exacerbations and remissions. There is a personal or family history of asthma, allergic rhinitis, food allergies, or eczema. In the acute phase, they may present with erythematous patches, weeping, and crusted plaques. In the chronic phase, they present with hyperpigmented lichenified lesions. It commonly affects the face, neck, wrists, antecubital, and popliteal fossae.