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Keratoacanthomas are flesh-colored, firm, and round growths that have unusual central crater consisting of a pasty material. Usually, keratoacanthomas occur on the back of the hand, forearm, and face and grow fast. In one or two months, they may grow up to two inches wide. In several months, they frequently start to disappear but can leave scars. Keratoacanthomas are not cancerous, but they may similarly resemble squamous cell carcinomas (skin cancer); therefore, a doctor frequently obtains a biopsy (specimen removal and testing under a microscope). Keratoacanthomas may be treated with fluorouracil, or Corticosteroid injection or surgically; both methods remove keratoacanthomas and commonly leave much less scarring than if the growth was left to disappear by itself.
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