Dermal and Subcutaneous Tumors

Aug 29, 2019 by in Dermatology Comments Off on Dermal and Subcutaneous Tumors

In this chapter proliferations derived from vascular endothelial cells, fibroblasts, myofibroblasts, smooth muscle cells, Schwann cells, and lipocytes are reviewed. Also discussed are several neoplasms of cells invading or aberrantly…

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Epidermal Nevi, Neoplasms, and Cysts

Aug 29, 2019 by in Dermatology Comments Off on Epidermal Nevi, Neoplasms, and Cysts

Epidermal Nevi Epidermal nevi are hamartomatous growths of the epidermis that are present at birth in about half of patients or develop early in childhood. The term epidermal nevus includes…

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Viral Diseases

Aug 29, 2019 by in Dermatology Comments Off on Viral Diseases

Viruses are obligatory intracellular parasites. The structural components of a viral particle (virion) consist of a central core of nucleic acid, a protective protein coat (capsid), and (in certain groups…

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Genodermatoses and Congenital Anomalies

Aug 29, 2019 by in Dermatology Comments Off on Genodermatoses and Congenital Anomalies

The genetic basis for common diseases such as atopic dermatitis and psoriasis, in addition to rare diseases, has been partially elucidated. Some genetic disorders are explained by mutations in a…

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Parasitic Infestations, Stings, and Bites

Aug 29, 2019 by in Dermatology Comments Off on Parasitic Infestations, Stings, and Bites

The major groups of animals responsible for bites, stings, and parasitic infections in humans belong to the phyla Arthropoda, Chordata, Cnidaria (formerly Coelenterata), Nemathelminthes, Platyhelminthes, Annelida, and Protozoa. This chapter…

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Diseases of the Skin Appendages

Aug 29, 2019 by in Dermatology Comments Off on Diseases of the Skin Appendages

Diseases of the Hair Normal human hairs can be classified according to cyclic phases of growth. Anagen hairs are growing hairs; catagen hairs are those undergoing transition from the growing…

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Errors in Metabolism

Aug 29, 2019 by in Dermatology Comments Off on Errors in Metabolism

Amyloidosis Amyloid is a material deposited in the skin and other organs that is eosinophilic, homogeneous, and hyaline in appearance. It represents beta-pleated sheet forms of various host-synthesized molecules processed…

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Chronic Blistering Dermatoses

Aug 29, 2019 by in Dermatology Comments Off on Chronic Blistering Dermatoses

In noninherited chronic blistering (vesicular or bullous) dermatoses, the cause of blistering is usually an autoimmune reaction, and the location where antibodies bind determines the clinical, histologic, and immunofluorescent pattern….

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Cutaneous Vascular Diseases

Aug 29, 2019 by in Dermatology Comments Off on Cutaneous Vascular Diseases

Raynaud Phenomenon and Raynaud Disease Raynaud phenomenon is characterized by episodic, recurrent vasospasm of the fingers and toes resulting in white, blue, and red discoloration provoked by cold or stress….

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Disturbances of Pigmentation

Aug 29, 2019 by in Dermatology Comments Off on Disturbances of Pigmentation

The visible pigmentation of the skin or hair is a combination of the amount of melanin, type of melanin (eumelanin vs. pheomelanin), degree of vascularity, presence of carotene, and thickness…

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