Seborrheic dermatitis is characterized by greasy, yellowish scales on an erythematous base, typically affecting areas rich in sebaceous glands (seborrheic areas) such as the scalp (dandruff, cradle cap in infants), eyebrows, nasolabial folds, retroauricular areas, and central chest. It can be mildly to moderately pruritic. A. Intensely pruritic vesicles on palms and soles are characteristic of dyshidrotic eczema (pompholyx). C. Well-demarcated, silvery-scaled plaques on extensor surfaces are characteristic of psoriasis vulgaris. D. Target lesions with central clearing are characteristic of erythema multiforme.
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