Related topics from Britannicaacne
any inflammatory disease of the sebaceous, or oil, glands of the skin. There are some 50 different types of acne. In common usage, the term acne is frequently used alone to designate acne vulgaris, ...
skin disease
The hair follicle from which the hair shaft emerges serves as a duct for conducting sebum, the oily product of the sebaceous gland, to the skin surface. The hair follicle and sebaceous gland together ...
sebaceous gland
small oil-producing gland present in the skin of mammals. Sebaceous glands are usually attached to hair follicles and release a fatty substance, sebum, into the follicular duct and thence to the ...
poison
Herbicides are chemicals used to kill plants. Their potential to produce toxicity in humans is rather low. High doses of 2,4-D, however, can produce muscular and neurological symptoms (Table 1). The ...
XYY-trisomy
relatively common human sex chromosome anomaly in which a male has two Y chromosomes rather than one. It occurs in 1 in 500-1,000 live male births, and individuals with the anomaly are often ...
vitamin A
Vitamin A excess, also called hypervitaminosis A, is a toxic condition produced by a high intake of vitamin A, generally 150,000 mug daily over a period of several months. Unlike the water-soluble ...
tetracycline
any of a group of broad-spectrum antibiotic compounds that have a common basic structure and are either isolated directly from several species of Streptomyces bacteria or produced semisynthetically ...
Klinger, Georgette
Czech-born American skin-care innovator (b. 1915, Brno, Czechoslovakia [now in the Czech Republic]-d. Jan. 9, 2004, New York, N.Y.), revolutionized the field of cosmetics and skin care by developing ...
nervous system disease
A number of genetically determined disorders of the ectoderm (the outside layer of cells in the embryo, from which the skin and the nervous system develop) are grouped together as the neurocutaneous ...
scar
mark left on the skin after the healing of a cut, burn, or other area of wounded tissue. As part of the healing process, specialized cells called fibroblasts in adjacent areas of skin produce a ...
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