Keratoacanthoma

Rarity: Common

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Science and technology

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What Wikipedia says

Keratoacanthoma (KA) is a common low-grade (unlikely to metastasize or invade) rapidly-growing skin tumour that is believed to originate from the hair follicle (pilosebaceous unit) and can resemble squamous cell carcinoma.

Excerpt from the Wikipedia article “Keratoacanthoma”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Jmarchn, CC BY-SA 3.0, via Wikimedia Commons.