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Add information on color and general revision.
[[Image:Keratinization_intact_vs_circumcised.JPG |thumbnail|right|200px| The glans and mucosa of intact and circumcised human penises in adult males.]]
'''Keratinization''' is the process whereby the surface of the [[glans]] and remaining [[preputial mucosa| mucosa]] of the circumcised penis become dry, toughened , hard and hardrelatively insensitive.<ref>{{REFweb
|url=https://medical-dictionary.thefreedictionary.com/keratinization
|archived=
|quote=
}}</ref> Normally, the glans is covered by the [[foreskin]], which moisturizes the area by [[transudation]], keeping the surface of the glans and inner mucosa moist and supple. After circumcision, however, the glans and surrounding mucosa become permanently externalized, and they are exposed to the air and the constant abrasion of clothing. These areas dry out, causing layers of keratin to build, giving the glans and remaining mucosa a dry, leathery appearance and reducing sensation.
The color of the glans penis in Caucasian males will vary. In intact males, the color of the glans penis is likely have a purple tint, while in circumcised and keratinized males the oolor is likely to be pinkish or flesh colored.
== Keratin as "Protection" ==
It was hypothesized in the past that the layers of keratin resulting from [[circumcision ]] provided a barrier of protection against [[Circumcision and Sexually Transmitted Diseases (STD's)| sexually transmitted diseases]]. In 1986, the late circumcision-advocate [[Aaron J. Fink]] invented the idea, without any evidence, that circumcision could prevent the transmission of HIV, arguing that the hard and toughened glans of the circumcised male resisted infection, while the soft and sensitive foreskin and glans mucosa of the intact male were ports of entry.<ref>{{REFjournal
|last=Fink
|first=Aaron J.