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[[Image:Keratinization_intact_vs_circumcised.JPG |thumbnail|right|200px| The glans and [[mucosa]] of intact and circumcised human penises in adult males.]]
Prior to [[circumcision]], the protected and covered glans is very smooth and has a glossy, shiny appearance. It is usually very sensitive to touch. '''Keratinization''' is the process whereby the surface of the [[glans]] and remaining [[preputial mucosa|mucosa]] of the [[circumcised]] [[penis]] become becomes dry, toughened, hard and relatively insensitive by a layer of [[keratin]].<ref>{{REFweb
|url=https://medical-dictionary.thefreedictionary.com/keratinization
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