If there is white dirt underneath the glans, it is recommended that the foreskin be completely turned up to fully reveal the glans and the coronal sulcus, which can be cleaned with water or light salt water. If there is redness, swelling, pain, etc., then you can use sodium bicarbonate solution for cleaning, or use potassium permanganate powder for dilution and local cleaning. After cleaning, dry the area, and keep the foreskin back to its original state, otherwise it may lead to local foreskin edema. The white dirt under the glans is mostly seen in poor personal hygiene, difficult to do regular cleaning, or the existence of long foreskin, prepuce, etc., due to a long time wrapped glans, local formation of foreskin scale or urine scale, etc. It is recommended that for patients with redness and pain in the glans, accompanied by secretions and dirt, wait for the inflammation to be controlled and then perform circumcision at a later date, so as to maintain local cleanliness.