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Histologic Diagnosis of Inflammatory Skin Diseases

Hair Follicles

…odex folliculorum. (×670) What generally is designated “folliculitis” really is infundibulitis, the infundibulum rather than the follicle being the epithelium involved. Infundibulitides usually are suppurative, e.g., noninfectious, as in…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Dandruff a Disease?

…dical Publishing, 1993:3.12 “I agree that pityrosporal folliculitis is not eczema. Neither is dandruff, but it may reasonably be described in the same chapter as seborrhoeic dermatitis.” Burton JL. Response to “Eczema revisited.&#…

Differential Diagnosis in Dermatopathology

Discussions

Perforating folliculitis and elastosis perforans serpiginosa have several findings histopathologic in common: an epithelial channel through surface epidermis; neutrophils in the channel; a collection of neutrophils contiguous with the channel; foci…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Sclerotic Fibroma?

…loped in association with an inflammatory process, especially folliculitis. . . . Our observations suggest that solitary sclerotic fibroma of the skin may be a degenerated or sclerotic end stage of other fibrous conditions, such as dermatofibroma, an…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

…s of any part of a follicle and in the absence of suppurative folliculitis or perifolliculitis, as illustrated here. 10.22.12A: Perifolliculitis, mixed-cell + 10.22.12B: Hyphae in a hair and an inner sheath = Dermatophytosis The presence of…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Study By Disease

…es (Quiz #658) Atopic dermatitis (Quiz #870) Bacterial “folliculitis” (Quiz #381) Basal-cell (trichoblastic) carcinoma, nodular type (Quiz #322) Basal-cell (trichoblastic) carcinoma, nodular type (Quiz #323) Basal-cell (trichoblastic) car…

Histologic Diagnosis of Inflammatory Skin Diseases

Algorithms Predicated on “Nonspecific” Findings

…association with epithelial mucinosis = Eosinophilic pustular folliculitis (in patients with HIV and Ofuji”s disease)     “Eosinophilic Spongiosis” Foci in an epithelium, particularly the epidermis, marked by spo…

Histologic Diagnosis of Inflammatory Skin Diseases

Elastosis perforans serpiginosa

…hat develops in some patients on renal dialysis); perforating folliculitis (which is suppurative infundibulitis in which a bolus of neutrophils causes a breach in the wall of affected infundibula, which is a near invariable accompaniment of suppurati…

Histologic Diagnosis of Inflammatory Skin Diseases

Reactive perforating collagenosis

…does not Differential diagnosis clinical Perforating “folliculitis” is a suppurative infundibulitis unrelated to trauma. Acquired perforating disorder of renal disease/diabetes begins as a suppurative infundibulitis and ends as picker&#…

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