The appearance of white dirt in the coronal sulcus is most likely due to local inflammatory glans infection and increased secretion caused by overcircumcision and circumcision. The first thing to do is to clean the white dirt with water or iodophor and apply anti-infection ointment, such as erythromycin ointment or fusidic acid cream for 1-2 weeks to effectively relieve the inflammation of the glans. The actual fact is that you will be able to get to a regular hospital as soon as the inflammation is better and do circumcision to remove the trigger, so that the inflammation of the glans is not likely to recur in the future. You should have good habits every day and wash your foreskin and glans with water before going to bed. It is best not to wash with soap and body wash these things because there is a certain irritation that may aggravate the inflammation.