Small meatballs protruding from the right inner wall of the mouth are considered to be mucous gland cysts, trauma-induced, oral polyps or sarcomas. 1. Mucous gland cysts: Eating or poor lip-biting habits may lead to mucous gland damage, duct blockage and then mucous gland cysts, manifested as painless lumps on the lips or cheeks. 2. Dysplasia or bad cheek biting habits may repeatedly stimulate the buccal mucosa leading to traumatic tissue proliferation, generally no special treatment, such as continued growth may choose to seek medical attention to remove. 3. Oral polyps or sarcomas may also appear painless lumps, usually choose surgical resection, should go to the hospital stomatology department to determine the nature of the lump before determining the treatment plan.