Psoriasis is a common disorder that affects men and women equally. Although psoriasis can begin at any age, the peak times for disease onset are young adulthood (ages 20 to 30 years) and late middle age (ages 50 to 69 years).

There are multiple clinical subtypes of psoriasis. Plaque psoriasis, the most common presentation of psoriasis, most commonly presents with sharply defined erythematous plaques with overlying silvery scale. The scalp, extensor elbows, knees, and back are common locations for plaque psoriasis lesions.

Atopic dermatitis (Eczema) is a chronic, pruritic, inflammatory skin disease that occurs most frequently in children, but also affects many adults. Clinical features of atopic dermatitis include skin dryness, erythema, oozing and crusting, and lichenification. Pruritus is a hallmark of the condition and is responsible for much of the disease burden for patients and their families.

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