The subcutaneous congestion in the coronal groove of the coitus may have a relationship with glans phimosis, and may be caused by friction of the foreskin. 1. glans phimosis: glans phimosis is an inflammation caused by infection of the external genitalia of the penis. Many men do not pay attention to personal hygiene after coitus, resulting in the foreskin scale constantly gathering, producing chlamydia, mycoplasma and other infections, inducing subcutaneous congestion in the coronal groove. 2. circumcision friction: during men and women’s coitus, it is possible that the amplitude of movement is large, the genitals constantly friction, resulting in the foreskin is also subjected to strong friction, resulting in subcutaneous congestion in the coronary groove. It is recommended that men with these conditions should not have intercourse for a while, and wait until the subcutaneous congestion at the coronary groove has completely improved before considering intercourse. If the patient is not feeling well, he should consult the doctor for examination and early treatment.