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Differential Diagnosis in Dermatopathology

Trichotillomania (developed fully) vs. Traction alopecia (end stage)

An inflammatory process that results from the effects of a drug administered systemically, e.g., by ingestion, inhalation, injection, or application rectally, and manifested usually by lesions distributed widely and symmetrically. Any of the many ex…

Histologic Diagnosis of Inflammatory Skin Diseases

Fox-Fordyce disease

…la of those latter two conditions rupture, granulomatous peri-infundibulitis is an inevitability. Spongiosis in infundibula may be encountered in seborrheic dermatitis and rosacea, including variants of it, namely, perioral and periocular dermatitis,…

Histologic Diagnosis of Inflammatory Skin Diseases

Keloid

…of a true keloid. Keloids may develop at sites of suppurative 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 t…

Histologic Diagnosis of Inflammatory Skin Diseases

Mucha-Habermann disease

…ne another, and papules usually are not purpuric. Suppurative infundibulitis is pustular and because it affects infundibula, individual lesions are more or less equidistant from one another. Miscues clinical as clues to diagnosis histopathologic Mu…

Histologic Diagnosis of Inflammatory Skin Diseases

Necrobiosis lipoidica

…on of keratocytes that tends to be accompanied by suppurative infundibulitis. That riveting finding is a clue helpful to differentiation of necrobiosis lipoidica from other palisaded granulomatous dermatitides, especially from granuloma annulare. Bib…

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