Generally speaking, the circle at the male crown groove is purple can be restored. The male coronal groove of a circle of purple state, often due to the cold weather, excessive frequent masturbation and other factors lead to local blood circulation is less, caused by the color of purple, which is a normal physiological phenomenon, usually pay attention to local warmth, reduce the number of times of masturbation, a period of time can be restored on their own. The male coronal groove of a circle of purple state may also be due to circumcision, due to the foreskin for a long time to the coronal groove wrapped up, resulting in the glans anterior part of the tissue hypoxia, ischemia, turn the foreskin, the local can be a slight purple, then you can carry out circumcision surgery, the coronal groove of the color can be restored generally. When a circle of purple color appears at the male coronal groove, there are many other reasons, and should be timely medical treatment.