Thank you for your query.
Please do not panic.
Male children have some whitish secretion that accumulates in the prepucial sac called smegma
most probably that is what you have found.
Semen usually appears after puberty
which usually occurs around 13 yrs of age.
Please clean the prepuce with soap water during bathing.This will take care of the problem and maintain adequate genital hygiene.
Hope this answers your query.
If you have any other queries kindly direct them to me.
Wishing a speedy recovery.
Have a nice day.