Histologic Diagnosis of Inflammatory Skin Diseases

Images

Images 10.39.1A: Infundibulitis, spongiotic, and peri-infundibulitis + 10.39.1B: Predominance of lymphocytes in and around infundibula dilated by corneocytes = Fox-Fordyce disease Spongiosis in the wall of an infundibulum near…

Histologic Diagnosis of Inflammatory Skin Diseases

Majocchi’s granuloma

…corneum. It is mandatory, therefore, that in every suppurative infundibulitis, cornified cells of both infundibular and surface epidermis, as well as of the follicle, be scoured for hyphae. When dermatophytic infundibulitis is suspected, numerous sec…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

Images 10.1.1A: Pustular dermatitis, infundibular + 10.1.1B: A comedo in association with granulomatous and fibrosing peri-infundibulitis = Acne vulgaris Many of the findings pictured here may be seen in other types of suppura…

Histologic Diagnosis of Inflammatory Skin Diseases

Hair Follicles

…la are filled with neutrophils. Much less common is spongiotic infundibulitis, e.g., so-called infundibulofolliculitis, in which spongiosis mediated by lymphocytes is present in the wall of infundibula. Different from spongiotic infundibulitis, but a…

Histologic Diagnosis of Inflammatory Skin Diseases

Identification of Basic Patterns: Skin: Fibrosing Dermatitis

…of acne keloidalis: sequence chronologically from suppurative infundibulitis to fibroplasia. The sequence, over a period of many years, of suppurative infundibulitis, extrusion of neutrophils in large number from the infundibulum, granulomatous infl…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

Images 10.27.1A: Pustular dermatitis, infundibular + 10.27.1B: Perivascular and interstitial infiltrate of many neutrophils and innumerable eosinophils in infundibula and sebaceous lobules = Eosinophilic pustular folliculitis Because eosi…

Histologic Diagnosis of Inflammatory Skin Diseases

"Perforating folliculitis" of chronic renal disease

…enal disease Comment This condition, essentially a suppurative infundibulitis, is vexing to patients practically and to physicians conceptually. It is troubling to patients because the suppurative infundibulitis induces maddening pruritus, and is fru…

Histologic Diagnosis of Inflammatory Skin Diseases

Elastosis perforans serpiginosa

Elastosis perforans serpiginosa Synonyms Elastoma intrapapillare perforans verruciforme Keratosis follicularis serpiginosa Serpiginous perforating elastosis Perforating elastoma Elastoma intrapapillare perforans Presentation stereotypical Age and…

Histologic Diagnosis of Inflammatory Skin Diseases

Reactive perforating collagenosis

…nical 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’s nodules; severe pruritus brou…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Pityrosporum Folliculitis and Demodectic Folliculitis?

“We suggest that pityrosporum folliculitis may either be due to the predisposition of the host in the presence of the Pityrosporum organism, or the pathogenicity of certain strains of the Pityrosporum organism is capable of producing follicul…