Hard lumps are found under the vulva skin and are not painful, commonly due to the following causes: First, hard chancre caused by syphilis, in which painless nodules at the vulva or labia majora are found clinically. The first of these is a painless nodule on the vulva or labia majora. After laboratory tests, syphilis spirochetes can be found. Second, vulvar fibroma, a single tumor growing on the outside of the labia majora, so hard nodules or swellings can be felt in the vulva, occasionally with pressure pain, or itching. Thirdly, vulvar cancer, vulvar cancer is a malignant tumor of vulva, often occurs as a hard mass on the labia majora, and it is accompanied by pain or itching, and cancer cells can be detected by pathological examination.