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In a large number of children the skin of penis(foreskin) can not retract properly.This Condition is called Phimosis
and This children have recurrent infection of penis because every human have a substance in the body of penis called smegma
which is very irritating to skin but usually washed away in normal individual. In Phimotic Children they can not washed away leading to infection.
So you please visit a surgeon for proper diagnosis and treatment.
not to be worried about.