Black hard lumps on the edge of tongue may be related to hemangioma, tongue inflammation, trauma and other reasons. 1. Hemangioma: During the period of differentiation of vascular tissues in embryonic development, the veins in the abdomen of the tongue are malformed, resulting in a large number of capillaries expanding abnormally and becoming hemangiomas, thus making black hard lumps on the edge of the tongue. 2. Tongue inflammation: if the tongue is locally infected or the body lacks vitamins, it will lead to tongue inflammation, causing local inflammatory reaction. Inflammatory substances are produced, and when it turns into chronic inflammation, inflammatory hard lumps can be formed, which leads to black hard lumps on the edge of the tongue. 3. Trauma: If you accidentally bite the edge of the tongue or collide with the tongue to cause injury, the edge of the tongue will be bruised, resulting in black lumps on the edge of the tongue. It is recommended that patients go to the hospital in time to see a doctor to clarify the cause of the disease and then actively treat it.