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===Foreskin in adulthood===
The foreskin may be retractable or non-retractable. Most men have a retractable foreskin , but about two to four percent have a longer, tighter, non-retractable foreskin, which is a normal varientvariant.
The foreskin (also known as the ''prepuce'') is the layered fold of smooth muscle tissue, blood vessels, neurons, [[skin]], and [[Preputial mucosa|mucous membrane]] part of the [[penis]] that covers and protects the [[glans penis]] and the urinary meatus.<ref name="cold-taylor1999"/> There are four layers in the foreskin. The top layer is either epidermis in the outer foreskin or [[mucosa]], in the inner foreskin. The second layer is the lamina propria. The third layer is the [[dartos]]. The fourth layer is the dermis. It is normal for the foreskin to become darker in color than the rest of one's body after puberty. This condition is called hyperpigmentation.