Hard bumps under the face are considered to be folliculitis, acne, boils and so on. 1. Folliculitis: under normal circumstances, there are bacteria colonizing the top of the skin, which is not easy to cause disease, but when there is damage to the skin, disease-causing bacteria will enter the skin to cause inflammation of the hair follicles, which is mainly characterized by the appearance of red pimples, which are manifested as hard bumps. 2. Acne: During puberty, the level of androgen in the body will be abnormal, at this time, sebum will be secreted in large quantities, resulting in sebum not being able to be completely discharged, and at this time, Propionibacterium acnes will multiply, resulting in acne, which may also be manifested as a hard pimple. 3. Boils: Boils are more commonly caused by Staphylococcus aureus infections and are more common on the head, face, neck and buttocks, etc. They start as small nodules and then gradually swell up, manifesting as hard bumps. Hard lumps under the face may also be due to other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.