The reason why the urine dirt is particularly large is urethritis, circumcision and glansitis. 1. Urethritis: Urethritis is generally caused by Chlamydia trachomatis infection, may also be caused by mycoplasma infection, and after urination do not pay attention to local skin cleaning may also cause urethritis. After the disease will lead to patients with increased urethral secretions, urethral itching and urinary discomfort, when the urethral secretions increase in a timely manner to clean up the urethral dirt will cause a particularly large. 2. circumcision and glansitis: refers to the penile foreskin and the head of the penis swelling and inflammatory reaction, due to the stimulation of inflammation, can be accompanied by odor or purulent secretion, secretion is not handled in time can be mistaken for urinary scales especially more. In addition, the cause of urinary dirt can also be seen in other diseases, the patient needs to consult a doctor in time to check, and early treatment.