Day: August 1, 2018

Definition Invasion of the skin, its appendages, and/or subcutaneous layer by way of thermal, mechanical, chemical, or physiologic injury and the colonization or infection with pathogenic bacteria of both aerobe

Bacillary angiomatosis (BA) is a systemic infection caused by Bartonella species, occurring nearly exclusively in HIV-infected individuals, characterized by cutaneous vascular tumors resembling Kaposi’s sarcoma and symptomatic multisystemic infection, most

Atherosclerosis obliterans (ASO), especially of the lower extremities, is associated with a spectrum of cutaneous findings, ranging from slowly progressive ischemic changes to the sudden appearance of ischemic lesions following

Aphthous ulcers (AU) are painful mucosal ulcerations of idiopathic etiology occurring commonly in the oropharynx and less commonly in the esophagus, upper and lower GI tract, and anogenital epithelium, characterized

Androgenetic alopecia (AGA) is the common progressive balding that occurs through the combined effect of a genetic predisposition and the action of androgen on the hair follicles of the scalp.

Alopecia areata is a localized loss of hair in round or oval areas without any visible inflammation of the skin in hair-bearing areas; the most common presenting site is the

Albinism describes a group of genetic alterations of the melanin pigment system that affect skin, hair follicles, and eyes. It principally involves the synthesis of melanin in these sites, but

Adverse cutaneous drug reactions (ACDRs) are common in hospitalized patients (2 to 3% experience ACDRs) as well as in ambulatory patients. Complications of drug therapy, overall, are the most common

Adult T cell leukemia/lymphoma (ATLL) is a neoplasm of CD4 + T cells, caused by human T cell lymphotrophic virus I (HTLV-I), manifested by skin infiltrates, hypercalcemia, visceral involvement, lytic

Sunburn is an acute, delayed, and transient inflammatory response of the skin after exposure to ultraviolet radiation (UVR) from sunlight or artificial sources. Sunburn is characterized by erythema and, if