Coronary groove red, the main consideration with trauma, foreskin glansitis, long foreskin and so on related. 1. Trauma: If the coronary groove area is rubbed by the underwear, or has been hit by external force, it can lead to damage to the coronary groove, and then redness, swelling and pain and other uncomfortable symptoms. 2. Inflammation of the foreskin and glans: after infection with bacteria and fungi, it can lead to local inflammation of the coronal groove, glans, foreskin and other parts of the coronal groove, resulting in redness and swelling of the coronal groove, itching and other symptoms. 3. Circumcision: the patient’s coronary groove will be wrapped by the foreskin for a long time, resulting in chronic local hypoxia, and the coronary groove may also appear red. If the phenomenon of red coronary groove, must pay attention to, as soon as possible to the medical examination and treatment.