Histologic Diagnosis of Inflammatory Skin Diseases

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…an infundibular cyst What is known, conventionally, as cystic acne represents rupture of an infundibular cyst with development, sequentially, of suppurative, granulomatous, and fibrosing inflammation in response to contents of the cyst that were prop…

Clinical Case Studies

Rhinophyma with Basal Cell Carcinoma

…right nasal dorsum. (Figure 1) The patient had long-standing acne rosacea and had been treated with topical metronidazole for 7 years followed by azelaic acid gel for 2 years prior to presentation. He had noticed increasing prominence of the nodule…

Histologic Diagnosis of Inflammatory Skin Diseases

Keloid

…uppurative infundibulitis (“folliculitis”), e.g., acne keloidalis, but not all papules and nodules of that condition show bundles of collagen like that of a keloid. In time, however, in the middle of a mass of such a fibroplasia, features…

Differential Diagnosis in Dermatopathology

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Acne vulgaris, erythematous papule Rosacea, erythematous papule…

Histologic Diagnosis of Inflammatory Skin Diseases

Factitious dermatitis and panniculitis

…eliberately (consciously or purposefully). Young persons with acne vulgaris may pick those lesions, often unconsciously, thereby creating a secondary factitious dermatitis. Our concern in this subchapter, however, is with disease of the skin and/or s…

Differential Diagnosis in Dermatopathology

Differential Diagnosis

Acne vulgaris, erythematous papule Rosacea, erythematous papule 1. Only one follicle involved usually in a 4 mm biopsy specimen 1. Nearly all follicles involved usually in a 4 mm biopsy specimen 2. Suppurative infundibulitis prominent 2. Suppu…