Is black blood bubble in mouth cancer?

Black blood bubbles in the mouth are not always cancer. Black blood bubbles in the mouth are caused by many reasons. First, various injuries to the mouth, such as bites or food friction injuries, cause blood accumulation in the mouth. Soft to the touch, the pain can gradually improve after a period of time. Or the black blood bubbles will gradually heal after disinfection puncture. Second, black spots on the mucous membrane. It refers to black plaques on the mucous membrane. Black spots themselves do not affect health, usually pay attention to oral hygiene to reduce the bad stimulation of black spots can be. Third, the black lesions of the oral mucosa, called malignant melanoma. It is a malignant tumor.