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In the practice of medicine, virtually every clinician encounters patients with skin disease. Physicians of all specialties face the daily task of determining the nature and clinical implication of dermatologic disease. In patients with skin eruptions and rashes, the physician must confront the question of whether the cutaneous process is confined to the skin, representing a pure dermatologic event, or whether it is a manifestation of internal disease relating to the patient's overall medical condition. Evaluation and accurate diagnosis of skin lesions are also critical given the marked rise in both melanoma and nonmelanoma skin cancer. Dermatologic conditions can be classified and categorized in many different ways, and in this Atlas, a selected group of inflammatory skin eruptions and neoplastic conditions are grouped in the following manner: (A) common skin diseases and lesions, (B) nonmelanoma skin cancer, (C) melanoma and pigmented lesions, (D) infectious disease and the skin, (E) immunologically mediated skin disease, and (F) skin manifestations of internal disease.

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(Figs. e16-1, e16-2, e16-3, e16-4, e16-5, e16-6, e16-7, e16-8, e16-9, e16-10, e16-11, e16-12, e16-13, e16-14, e16-15, e16-16, e16-17, e16-18, and e16-19) In this section, several common inflammatory skin diseases and benign neoplastic and reactive lesions are presented. While most of these dermatoses usually present as a predominantly dermatologic process, underlying systemic associations may be made in some settings. Atopic dermatitis is often present in patients with an atopic diathesis, including asthma and sinusitis. Psoriasis ranges from limited patches on the elbows and knees to severe erythrodermic involvement and associated psoriatic arthritis. Some patients with alopecia areata may have an underlying thyroid abnormality requiring screening. Finally, even acne vulgaris, one of the most common inflammatory dermatoses, can be associated with a systemic process such as polycystic ovarian syndrome.

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Figure e16-1
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Acne vulgaris with inflammatory papules, pustules, and comedones. (Courtesy of Kalman Watsky, MD; with permission.)

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Figure e16-2
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Acne rosacea with prominent facial erythema, telangiectasias, scattered papules, and small pustules. (Courtesy of Robert Swerlick, MD; with permission.)

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Figure e16-3
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Psoriasis is characterized by small and large erythematous plaques with adherent silvery scale.

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Figure e16-4
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Atopic dermatitis with hyperpigmentation, lichenification, and scaling in the antecubital fossae. (Courtesy of Robert Swerlick, MD; with permission.)

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Figure e16-5
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Dyshidrotic eczema, characterized by deep-seated vesicles and scaling on palms and lateral fingers, is often associated with an atopic diathesis.

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