There are several types of blisters in the mouth, including blood blisters, mouth ulcers, blisters, and white blisters. Most of the scattered or cluster-like small blisters are caused by herpes virus infection and require targeted antiviral treatment. Mouth ulcers are related to B vitamin deficiency and long-term antibiotic use, so attention should be paid to vitamin supplementation and topical application of topical stannous dispersion. Most of the blood bubbles are caused by submucosal bleeding caused by chewing damage to the pharyngeal mucosa or hard food damage to the oral mucosa, which generally does not require special treatment and will be slowly absorbed after 2-3 days. Opaque white vesicles should consider the possibility of mucous gland cysts, need to go to the hospital stomatology department for a clear diagnosis, and then surgical treatment. Usually pay attention to oral hygiene and eat more fresh vegetables and fruits.