Blocked glands, old infections, and old trauma can all cause painless hard lumps in the labia majora, and there are different treatment principles for different causes of hard lumps in the labia majora. Hard lumps caused by old scarring can be left untreated; hard lumps caused by blocked glandular openings, resulting in the accumulation of glandular secretions and hard lumps caused by inflammation need to be treated to avoid secondary infection and serious ulceration. Therefore, once there is a hard lump inside the labia majora that is not painful, patients need to go to the hospital for examination in time.