A large hard bag growing in the center of the eyebrow may be caused by folliculitis, sebaceous cysts, etc. Such people should seek medical attention in time to clarify the cause of the disease and then treat it. 1. Folliculitis: bacteria, fungi, viruses, etc. caused by the hair follicle as the center of the hard lump, the patient will also have local redness, swelling and hot pain, should pay attention to keep the eyebrow clean, when necessary, local use of iodine povidone, mupirocin, fusidic acid, clindamycin and other drugs. 2. Sebaceous cysts: benign skin lesions that occur in the head, face, buttocks and other parts of the body due to the gradual accumulation of sebum, small time can be manifested as a localized hard bag, usually without special treatment, when repeated infections, it is recommended that the infection subsides through surgical excision. When the above symptoms occur, it is recommended to consult the dermatology department of the hospital, and the above medications and treatments should be carried out under the guidance of a doctor.