A Clinical Atlas of 101 Common Skin Diseases

Syphilis

An inflammatory process, caused by the spirochete Treponema pallidum, that tends to evolve through three stages, namely, primary (typified usually by a solitary chancre), secondary (characterized by widespread macules and papules on skin and mucous…

A Clinical Atlas of 101 Common Skin Diseases

Verrucae

Papules on skin and mucous membranes that result from infection of keratinocytes by different types of papillomavirus and classified according to their silhouettes, to wit, papillated (verrucae vulgares on different sites such as volar skin, i.e., v…

Histologic Diagnosis of Inflammatory Skin Diseases

Identification of Basic Patterns: Skin: Perivascular Dermatitis

See Figs. 5.16 A&B, 5.17 A&B, 5.18 A&B, 5.19 A&B, 5.20 A&B, 5.21 A&B, and 5.22 A&B Figure 5.16 A. Perivascular dermatitis, perivascular only, superficial. B. Perivascular dermatitis, perivascular only, superficial and…

Histologic Diagnosis of Inflammatory Skin Diseases

Embryologic Development

…fingertips and nail beds, and then elsewhere on what is called glabrous skin, glabrous referring to skin that is smooth and which sports vellus hairs, but not terminal ones. Early in embryogenesis, the interface between epidermis and dermis is flat….

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…

Histologic Diagnosis of Inflammatory Skin Diseases

Lichen planus

Lichen planus Synonyms Lichen ruber planus Lichen ruber Presentation stereotypical Age and sex More common in women, especially young and middle-aged adults Distribution of lesions Flexor surface of forearms and wrists, but no site is exempt. Occu…

Differential Diagnosis in Dermatopathology

Discussions

Few subjects are as baffling and frustrating to dermatopathologists than the alopecias. Those aberrations are rivaled in difficulty only by diseases of nail units. Why do those subjects prove to be so recondite? Because biopsies of alopecias and dis…