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}}</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" ==