A red bump on the side of the tongue may be related to lobular papillitis, papilloma, dental factors and other causes. 1. Lobulated papillitis: When the lobulated papillae on the side of the tongue are inflamed, they become congested and enlarged, resembling a pimple. 2. Papilloma: If the side of the tongue is infected by a virus, red bumps may grow on the lateral edge of the tongue. 3. Dental factors: due to large rough tartar or ectopic wisdom teeth, etc., the mucosa of the lateral edge of the tongue can be frequently stimulated, repeated injury occurs, and in the long run, it can cause mucosal hyperplasia, which is manifested as a red pimple. It is recommended that the person who has a red bump on the side of the tongue go to the hospital in time to clarify the cause and carry out standardized treatment under the guidance of the doctor.