A layer of white dirt in the foreskin a day without washing, if there are no other uncomfortable symptoms, usually the product of normal metabolism, that is, the foreskin scale, generally belong to the normal physiological phenomenon. If accompanied by other uncomfortable symptoms, may be for the foreskin glans, sexually transmitted diseases and other pathological phenomena. 1. foreskin scale: foreskin scale is the glans and the foreskin between the inner plate of the foreskin cavity of the accumulation of material, because the glans surface attached to a layer of mucous membrane cells, with the body metabolism can be naturally shed, and urine mixed together, so there is a layer of white dirt in the foreskin a day without washing the phenomenon. Especially common in circumcision, circumcision men. 2. Foreskin glans: If you don’t pay attention to personal hygiene, sexual hygiene, etc., leading to pathogenic bacteria invade the foreskin, glans localization, triggering the foreskin glans inflammation, local redness, swelling, pain, itching and other symptoms. Due to edema caused by a large number of oozing, can also be accompanied by a layer of white dirt within the foreskin a day without washing, can also be grayish-white dirt, the need for timely medical treatment. 3. Sexually transmitted diseases: common sexually transmitted diseases such as gonorrhea, genital herpes, such diseases can lead to an increase in local secretions, can appear in the foreskin white dirt-like changes, the patient has a history of unclean sexual contact, should go to the professional dermatology and venereal diseases in time. Therefore, men should pay attention to personal hygiene, daily open the foreskin, rinse the local after drying with water, keep the local dry. For men with long foreskin, it is recommended to carry out circumcision in time to avoid excessive accumulation of foreskin scales, long-term stimulation of local inflammation, tumors and other diseases, which is not conducive to good health.