Common causes of hard bulges on the face include acne, folliculitis, epidermal cysts, etc. 1. Acne: Facial follicle hyperkeratosis, exuberant androgen secretion, local microbial infections and other factors can lead to facial cystic nodular acne, which can be manifested as skin nodules, hard and painful. 2. Folliculitis: Folliculitis is caused by bacterial, fungal and other pathogenic infections of the hair follicles, facial folliculitis can appear as inflammatory papules centered on the hair follicles, redness, swelling, itching, pain and other symptoms. 3. Epidermal cysts: formed with trauma and other causes of epithelial cell implantation in the epidermis, the clinical manifestation is a round swelling on the skin, the surface is smooth and moderately hard, and there may be pain when secondary infection occurs. It may also be caused by other reasons, it is recommended that the patient go to the hospital in time and follow the doctor’s instructions for treatment.