Small rice bumps under the tongue may be caused by papillitis of the tongue, sublingual cysts, warts and other reasons. 1. papillitis of tongue: lack of micronutrients, local infections, systemic diseases and other causes of papillitis of tongue, may appear under the tongue with small rice bumps, redness and swelling, accompanied by numbness, pain and other conditions. 2. Sublingual cysts: Sublingual cysts caused by blockage of sublingual ducts and local trauma may appear as small rice-grain bumps under the tongue. 3. Condyloma acuminatum: HPV virus attacks the oral cavity, sublingual skin mucosa caused by condyloma acuminatum, resulting in the appearance of some warts in the oral cavity, sublingual and other parts of the mouth, manifested in the symptom of small rice bumps under the tongue. Mouth ulcers, polyps and other causes can lead to the appearance of the tongue under the small grain bumps, it is recommended that the patient timely consultation, under the guidance of the doctor to clarify the diagnosis, targeted treatment. Drink plenty of water and pay attention to oral hygiene.