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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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