If the white bumps protrude from the mucosa with clear boundaries, they are usually caused by white papular lesions in the tongue mucosa, which are essentially due to hyperkeratosis or dyskeratosis of the tongue mucosa epithelium, resulting in abnormal keratotic hyperplasia of the local mucosa, manifested as white papules and papules. The most common causes of keratosis are excessive and frequent mechanical frictional stimuli, and excessively cold or hot temperature stimuli, such as stumpy crowns, stumpy roots, and rough and uneven tartar surfaces. If the white bumps are above the mucosal surface and have a tumor-like lesion with a tip, papilloma usually occurs.