A white substance in the foreskin of a child may be the result of circumcision, pearly pimples and other causes. The white substance in the foreskin of children may be the foreskin scale, which is formed due to the sebaceous gland secretion of the foreskin as well as the epithelial keratin shedding. If foreskin scale is found, the foreskin should be turned over and cleaned in time when bathing to avoid long-term stimulation of local skin and causing infection. Pearly papules can also show white papules, mostly due to poor foreskin hygiene or coronal infection of the foreskin, physiological developmental variations and other reasons, causing white pearly, translucent papules in the coronal groove of the penis. White color in the foreskin of children can also be seen in other causes, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions for relevant examinations, and deal with or treat with the help of the doctor.