Definition: a common form of fungus infection of the scalp caused by various species of Microsporum and Trichophyton on or within hair shafts, occurring most commonly in children and characterized by irregularly placed and variously sized patches of apparent baldness because of hairs breaking off at the surface of the scalp, scaling, black dots (see black-dot ringworm), and occasionally erythema and pyoderma.
Synonym(s): ringworm of scalp
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Examples: glitazone, GI cocktail, etc.