Histologic Diagnosis of Inflammatory Skin Diseases

Identification of Basic Patterns: Skin: Pustular Dermatitis

See Fig. 5.307 A&B. Figure 5.307 Pustular dermatitis. A. Infundibular. B. Surface epidermal. Although most pustules in skin are housed in infundibular epidermis (Fig. 5.308 A&B), many are lodged in surface epidermis (Fig. 5.309 A&B)….

Histologic Diagnosis of Inflammatory Skin Diseases

Identification of Basic Patterns: Skin: Perivascular Dermatitis

…apule that is brought about by the effects of both rubbing and scratching energetically is termed a “picker’s nodule” (Fig. 5.165 A&B). Scratching wildly may initiate a variety of changes in the skin, among those being signs of…

Differential Diagnosis in Dermatopathology

Pyogenic granuloma vs. Bacillary angiomatosis

A papular and pustular inflammatory process that is centered in follicles and is distributed mostly in the middle third of the face in both vertical and horizontal directions. Among the varied manifestations of rosacea are innumerable telangiectases…

Differential Diagnosis in Dermatopathology

Discussions

Because bacillary angiomatosis of acquired immunodeficiency syndrome (AIDS) and pyogenic granuloma are vascular proliferations in the skin that have many features clinical and findings histopathologic in common, they may be mistaken easily for one a…

Histologic Diagnosis of Inflammatory Skin Diseases

Nail Units

A nail unit consists of a nail plate and tissues around and under it (Fig. 1.60). Situated on the dorsal aspect of the distal phalanx of every finger and toe, a nail, known also as a nail plate, is a hard, convex, rectangular, translucent structure…

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…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Dandruff a Disease?

“Seborrheic dermatitis consists of a dry form (simple dandruff), with small dry to thick powdery scales . . .” White JW. Localized eczematous disease. In: Sams WM, Lynch PJ, eds. Principles and practice of dermatology. New York, NY: Ch…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Xerosis, Asteatosis, Asteatotic Eczema, Eczema Craquelé, and Dry Skin?

“Asteatosis Synonyms: Xerosis. Ger asteatose; Fr ast√©atose Definition: Asteatosis is that condition of the skin in which there is absolute or relative deficiency of the sebaceous secretion.” Ormsby OS, Montgomery H. Diseases of the app…

Histologic Diagnosis of Inflammatory Skin Diseases

Lichen simplex chronicus/Prurigo nodularis/Picker’s nodule/Erosions/Ulcers

…sui generis, but rather the result of animated rubbing and of scratching skin that itches by virtue of a combination of influence genetic, i.e., the atopic state (for which reason mucous membranes itch in response to pollens, danders, and “dus…