A hard bump on the face is considered to be related to boils, sebaceous cysts, scars, dermatofibromas and other factors. 1. Boil: an acute purulent inflammation caused by bacterial infection of hair follicles and surrounding tissues, which can be manifested as a hard bump on the face, accompanied by redness, swelling and pain. 2. Sebaceous cysts: The sebum cannot be discharged smoothly, leading to the accumulation of sebum and the formation of cysts, which can also be manifested as hard bumps on the face. 3. Scars: for patients who have had surgery or trauma to the face, due to the repair of local tissue granulation tissue after the injury, if the excessive growth of granulation tissue will lead to the emergence of local scars and other hard nodules. 4. Dermatofibroma: its etiology is still unclear, it may be related to mosquito bites, patients are mostly manifested as local solid nodules, smooth surface, patients generally no pain, itching and other discomforts, generally more to touch the facial hard nodules and found. For patients with long hard bags on the face, it is recommended to go to the regular hospital in time, clear cause of the disease under the guidance of the doctor active treatment.