Keratinization

The glans (head) of the penis is a genital structure that is normally protected from external contact by the foreskin of the natural penis. When the penis is modified by permanent retraction of the foreskin, then this natural protection is lost and a process called keratinization proceeds to protect the delicate glans surface tissue from drying and the abrasion of the external environment. In other words, the normally delicate and smooth glans external membrane becomes calloused, or keratinized.

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