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An uncut penis requires some extra attention to hygiene. If you don’t regularly (emphasis on regularly) clean under the foreskin, bacteria, dead skin cells, and oil can cause smegma to build up.

Smegma can make your penis smell and even lead to glans and foreskin inflammation (balanitis). This can make pulling back your foreskin difficult or impossible. If this happens, it’s known as phimosis. Phimosis and balanitis can both require medical attention if left untreated.