The coronary groove is particularly itchy, red and swollen, may be fungal infection, and may also have a relationship with the foreskin glans, local allergic reaction and other diseases. 1. Fungal infection: there are many men who do not pay attention to genital hygiene, there may be a combination of fungal infections, manifested in the coronary groove redness, swelling, itching and other symptoms. It is recommended that patients usually pay attention to cleanliness and hygiene, and at the same time can be under the guidance of the doctor, apply antifungal drug treatment, such as fluconazole, itraconazole and so on. 2. Gonorrhea: patients with gonorrhea and bacterial infection, manifested in the coronal groove redness, swelling, itching and other symptoms. It is recommended that patients apply erythromycin ointment under the guidance of the doctor to improve the symptoms. 3. Local allergic reaction: some men have an allergic reaction to condoms, especially latex components of condoms, easy to cause contact dermatitis, resulting in coronal inguinal redness, swelling, itching and other symptoms, it is recommended to avoid the use of allergic material condoms, can improve the symptoms. All the above drugs need to pay attention to the side effects and adverse reactions of drugs, please use the above drugs under the guidance of a doctor. It is recommended that patients usually keep the coronary groove and the penile area clean, hygienic, dry, pay attention to the diligent replacement of underwear, try not to use irritating strong detergent products to wash the intimate parts, to avoid redness, swelling, pain, itching and other phenomena.