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SirConcis
Guest
The darkening of the shaft skin is genetic and environmemtal. It is icreased pigmentation due to melanin production. Similar to why black people have darker skin than white people, or how white people tan after being exposed to the sun.
IThe darkening generally happens in the last stages f puberty/early adulthood.
IThe darkening generally happens in the last stages f puberty/early adulthood.