A few small red dots on the glans coronal groove are mainly considered to be related to eczema, prepuce glans, skin allergies, syphilis, condyloma acuminatum and other diseases. 1. Eczema: it can lead to the appearance of red pimples of the size of a pinhead to a grain of corn on the affected area, accompanied by itching and other uncomfortable symptoms. 2. circumcision: mainly caused by bacterial infection, can lead to the glans and the coronary groove red, swelling, burning pain, and sometimes red pimples, itching and other symptoms. 3. Skin allergy: allergy to underwear or condoms can trigger skin allergy, which can lead to red pimples, itching and other uncomfortable symptoms. 4. Syphilis: especially the second stage of syphilis, can lead to the patient’s genital organs appear syphilis rash, and then appeared glans and coronary groove red spot symptoms. 5. Condyloma acuminatum: In the early stages of the disease, it can lead to the appearance of single or multiple red papules on the genital organs of the patient, and gradually develop into cauliflower-like warts. The red spots on the glans and the coronary groove may also be related to other factors, it is recommended to go to the urology department in time to clarify the cause of the problem, and the specialist doctor to formulate a plan for the treatment.