There is a hard bag growing inside the buttock flesh, it should belong to lipoma, sebaceous cyst, hair follicle inflammation, or myofibroma, the specific need to be examined, to be able to confirm the diagnosis. 1. Lipoma: generally and fat metabolism abnormalities, inflammatory stimuli or intestinal malnutrition, there is a certain relationship, pay attention to more observation, lipoma is generally very smooth, no pain. 2. Sebaceous cysts: mostly due to the sebaceous gland secretion is more exuberant, the local place appeared in the ball, lumpy objects, may appear red, swollen, or painful symptoms. 3. Inflammation of hair follicles: the pores of hair follicles secreting sweat glands are blocked, resulting in localized inflammation, which may be red, swollen and painful. 4. Myofibroma: the cause is related to hormone or traumatic stimulation, resulting in the buttocks or shoulder blades and other parts of the symptoms of small hard bags.