The itchy glans at the coronal groove is related to not paying attention to local hygiene or factors such as circumcision and glans inflammation and allergy. Patients with long foreskin or prepuce are prone to produce a large amount of foreskin scale, due to the usual not pay much attention to local hygiene, the accumulation of foreskin secretion can easily lead to inflammation of the foreskin and glans, the inner plate of the foreskin and glans may appear red, swollen, painful, itchy, etc., and the coronal groove can have a large amount of cheese-like secretion. If contacted with allergens, it can stimulate the local mucosa to have an allergic reaction, and if it occurs at the coronal groove it can also lead to itching and edema in this area. If the symptoms do not improve after the usual cleaning, it is recommended that the patient go to the hospital to find out the specific cause of the disease, and then give the appropriate treatment.