White color generally refers to white dirt. White dirt in the coronal groove and inner foreskin can be categorized as physiologic and pathologic. Physiologic is related to phimosis. Pathologic and glans inflammation, urinary tract infection. If you exclude physiological reasons, it is recommended that the patient go to the hospital in time. 1. Physiological: the white color of the coronal groove and the inner side of the foreskin may be due to the patient’s foreskin is too long, daily secretions and dirt accumulation, and no other uncomfortable symptoms, as long as you pay attention to daily cleaning can be. 2. Pathologic: (1) glans inflammation: it can lead to the appearance of redness and swelling of the foreskin, burning pain, aggravated by urination, and pus secretion flowing from the opening of the foreskin and other symptoms. Purulent secretion outflow accumulates in the coronal groove and the inner side of the foreskin, then white dirt can be seen. (2) Urinary tract infections: frequent urination, painful urination, urgency, redness and swelling of the urethral opening often occur, which can also lead to an increase in daily secretions and whiteness. The accumulation of secretions can also lead to white dirt in the coronal groove and the inner side of the foreskin. If physiological causes are excluded, patients are advised to go to the hospital in time.