keratoacanthoma

noun
ker·a·to·ac·an·tho·ma | \ˌker-ət-ō-ˌak-ˌan-ˈthō-mə \
plural keratoacanthomas also keratoacanthomata\-mət-ə \

Medical Definition of keratoacanthoma 

: a rapidly growing skin tumor that occurs especially in elderly individuals, resembles a carcinoma of squamous epithelial cells but does not spread, and tends to heal spontaneously with some scarring if left untreated

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