Macrophage/Monocyte Disorders
This chapter includes granulomatous and histiocytic conditions that are either localized to the skin or can involve the skin as part of a systemic disease. Many will require a skin…
Dermatology
Viral Diseases
Viral diseases can manifest as nonspecific exanthems, such as in measles and many other morbilliform eruptions, or more specific patterned eruptions, such as the papules on the cheeks, elbows, knees,…
Cutaneous Lymphoid Hyperplasia, Cutaneous T-Cell Lymphoma, Other Malignant Lymphomas, and Allied Diseases
The evaluation of lymphoid neoplasms typically requires clinicopathological correlation, and classification often requires panels of immunostains. This section of the atlas will focus on the clinical appearance of cutaneous lymphomas…
Diseases of Mucous Membranes
Diseases of the mucous membranes include those involving the lips, tongue, palate, gingiva, teeth, and the floor of the mouth. Inspection of this entire surface should be included in the…
Melanocytic Nevi and Neoplasms
The evaluation of pigmented lesions is one of the most important skill sets in dermatology. The incidence of melanoma continues to increase, and early diagnosis plays a critical role in…
Errors in Metabolism
This chapter provides images of a collection of conditions that result from errors in metabolism. Many of these diseases manifest in the skin secondary to the deposition of material such…
Chronic Blistering Dermatoses
Immunobullous dermatoses may present with urticarial lesions, blisters, erosions, or pustules. IgA-mediated disease is characterized by annular lesions with a “string of pearls” morphology—bullous in the case of linear IgA…
Disturbances of Pigmentation
Pigmentary disorders of the skin may present with depigmentation, hypopigmentation, or hyperpigmentation. The color, morphology, and distribution of the lesions help to suggest the correct diagnosis. Vitiligo may be segmental…
Parasitic Infestations, Stings, and Bites
Bites and infestations present with wide-ranging manifestations, including papules, vesicles, excoriations, and urticarial lesions. Bedbug bites often involve the arms and develop clinical features of prurigo nodularis. A biopsy will…
Diseases Resulting From Fungi and Yeasts
Fungi and yeasts can cause both superficial and deep infections in the skin with a great variation in clinical findings. In healthy hosts, commensal organisms such as candida remain superficial,…
