Smegma is the natural lubricant found under the foreskin of males that enables the foreskin to slide back and forward across the head of the penis. It may appear as a white discharge similar to milk curds if present in excess, particularly in uncircumcised boys and men who have a narrow opening to the foreskin.

It is not necessary to clean smegma away, and excessive cleaning under the foreskin may cause soreness and dryness due to a lack of smegma.

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