The small red dots in the coronal groove may be caused by excessive masturbation and other stimuli, the foreskin glans and eczema of the glans, etc. It is recommended that further examination to clarify the cause of the disease. 1. Excessive stimulation: If there is excessive masturbation, violent sex and other excessive stimulation, may lead to the foreskin and glans red and swollen, as well as red spots in the coronal groove and other symptoms. 2. circumcision and glansitis: for circumcision and phimosis, if you don’t pay attention to personal hygiene and don’t do a good job of timely cleaning, it is easy to lead to the accumulation of foreskin scales, long-term chronic stimulation will lead to circumcision and glansitis, which may appear in the coronal groove of the red spots and pain and other manifestations. 3. Eczema: If there are immunodeficiency and other immune function abnormalities, environmental changes and allergen stimulation may cause eczema on the glans, resulting in red spots and pain. Coronary groove small red spots a little pain may also be caused by other factors, therefore, it is recommended that patients go to the regular hospital in time for further consultation and treatment, and strive for early recovery.