Histologic Diagnosis of Inflammatory Skin Diseases

Identification of Basic Patterns: Skin: Fibrosing Dermatitis

See Fig. 5.350 A&B. Figure 5.350 Fibrosing dermatitis. A. Early. B. Late (sclerosis). Fibrosing dermatitis (as well as fibrosing peri-infundibulitis/perifolliculitis and fibrosing panniculitis) results, in every instance, from injury to nonep…

Histologic Diagnosis of Inflammatory Skin Diseases

Cat-scratch disease

Cat-scratch disease Presentation stereotypical Age and sex Any age and either sex, but children and young adults preponderantly Distribution of lesions Localized at the site of a scratch or a bite by a cat Individual lesions Papules, pustules, or cr…

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…

Histologic Diagnosis of Inflammatory Skin Diseases

Pattern Analysis in Historical Perspective

In 1963, the year that one of us (A.B.A.) began a residency in dermatology, Walter Lever’s textbook, Histopathology of the Skin, was in its third edition and was deemed, universally, to be “the bible” of dermatopathology. To a firs…

Histologic Diagnosis of Inflammatory Skin Diseases

"Folliculitis" (Infundibulitis)

“Folliculitis” (Infundibulitis) Synonyms What is designated, universally, folliculitis is, in actuality, infundibulitis. In short, infundibulitis is NOT a synonym for folliculitis; the former, for purposes practical, is a suppurative pro…

Differential Diagnosis in Dermatopathology

Discussions

Erythematous papules of acne vulgaris and of rosacea have in common localization mostly to the face, suppurative infundibulitis, and a mixed infiltrate of inflammatory cells in the dermis, it containing lymphocytes and plasma cells, and sometimes hi…

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…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Changing Mole?

“Any single nevus that is noted to change independently should be cause for alarm.” Rhodes AR. Neoplasms: benign neoplasias, hyperplasias, and dysplasias of melanocytes. In: Fitzpatrick TB, Eisen AZ, Wolff K, et al., eds., Dermatology…

Histologic Diagnosis of Inflammatory Skin Diseases

Infundibulitis secondary to agents topical

Infundibulitis secondary to agents topical Comment Noninfectious infundibulitides can be divided roughly into those of cause internal and those of cause external. Examples of internal causes of suppurative infundibulitis are drugs of different kinds…