A small hard lump on the right chin that moves can be caused by the following diseases: sebaceous cyst, lymphadenitis. Sebaceous glands are abundant in the chin, and if they become blocked, sebaceous cysts may appear as hard lumps, which are relatively mobile, often with a black spot in the center, and if infected, the area may become red, swollen and painful. Lymph nodes exist in the chin, if the tissues around the lymph nodes are inflamed, such as pharyngitis, gingivitis, etc., the inflammation may spread to the lymph nodes in the chin, which will lead to lymphadenitis, and the lymph nodes will be enlarged, which will be manifested by the appearance of localized hard lumps, and the enlarged lymph nodes will be able to move. It is recommended that the patient go to the hospital, can improve the ultrasound and other examinations, combined with the hard lump of palpation, usually can be clearly diagnosed, and then you can carry out the appropriate treatment.