Glans a day without washing produces dirt, possible reasons: 1, foreskin is too long, patients are prone to produce foreskin scale, local subcutaneous can be mud-like, generally no pain, itching and other discomfort, regular cleaning can keep the local clean. The symptoms can be reduced after washing, but without washing, the white film or mycelium can reappear. Treatment requires the retention of relevant secretions for fungal smear examination. If the fungal infection is diagnosed, external washing with sodium bicarbonate solution and topical application of miconazole ointment after washing is required. When the fungal infection is cured, there will be no recurrence of fouling.