Itchy white discharge in the coronal groove may be caused by various types of glans phimosis, such as bacterial glans phimosis, fungal glans phimosis, trichomonas glans phimosis and so on. 1. Bacterial glans phimosis: prolonged failure to clean the inside of the foreskin may induce bacterial infection, which will make the coronal groove itchy with white secretion, and is accompanied by redness, tingling and other symptoms. 2. Fungal circumcision: men with foot odor, socks and underwear washing at the same time, may lead to the presence of fungal infections in the penis, triggering fungal circumcision, which will make the coronal groove itchy white discharge, accompanied by peeling, pain and other symptoms. 3. Trichomoniasis: may be related to unclean sex, can make men suffer from trichomoniasis, can lead to white secretion in the coronal groove area, itching, and in severe cases there will be erosion, oozing and other symptoms. Itchy white discharge in the coronal groove may be due to the above causes, and patients are advised to seek medical examination and treatment as soon as possible.