Black lumps on the edge of one side of the tongue may be triggered by trauma, while there is also the possibility of benign or malignant tumors. 1. Trauma, if the tongue is stimulated by a foreign object in the process of eating, resulting in rupture of the capillaries of the tongue and the emergence of hematoma, it may produce black lumps on the edge of one side of the tongue. 2. Benign tumors, patients with benign tumors of the tongue may produce lumps due to the compression of the tongue tissues by the tumor, and thus this kind of symptom may arise. 3. Malignant tumors, some patients with malignant tumors of the tongue after malignant tumor cells invade the tongue tissue, which may lead to lesions of the tongue, so there will be a black lump on the edge of one side of the tongue. Normally, we need to observe the patient’s physical condition more often, when there is an abnormal reaction, it is best to consult a doctor in time.