Forehead long a hard bag does not hurt, itchy may be with sebaceous cysts, lipomas, dermatofibroma, etc., generally used surgical treatment, laser treatment, etc.. 1. Sebaceous cysts: mostly due to sebaceous gland excretory duct obstruction, sebaceous gland cystic epithelium expansion and formation. Usually there are no uncomfortable symptoms, and it is usually treated by surgical incision to remove the swelling. 2. Lipoma: it may be related to connective tissue degeneration stimulated by inflammation, metabolic abnormalities and disorders of adipose tissue. It can occur in any part of the body with fat, and lipoma is seldom malignant and can be surgically removed. 3. Dermatofibroma: Dermatofibroma is mainly composed of benign fibrous connective tissue with smooth edges and hard texture. They are benign tumors of fibrous connective tissue origin and can occur in various parts of the body. Generally, it can be treated without treatment and regular follow-up is sufficient. If the growth rate increases significantly or the patient’s own pursuit of aesthetics, etc., the option of complete surgical removal. When a hard bag grows on the forehead without pain or itching, it is recommended to consult a doctor in time, follow the doctor’s instructions for further examination, clarify the cause with the help of the doctor, and carry out targeted treatment or therapy.