Mouth ulcers pus if the symptoms are mild or no systemic symptoms can generally be self-healing, it takes a relatively long time, you can promote the healing of mouth ulcers through topical medication, such as cediriodine tablets, rehabilitation of new liquid, etc., the details are as follows. The pus in the mouth ulcers may be due to the larger and deeper lesions of the mouth ulcers, which are caused by microbial infections. Because mouth ulcers have the self-limiting property of not healing, so after the occurrence of pus, it can also be healed by itself. Mild mouth ulcers last about 7 to 14 days, and if suppuration occurs, the duration is usually greater than 14 days. The healing of mouth ulcers can be promoted by topical medications, such as cediriodine tablets, which have bactericidal and astringent effects, and topical healing solution, which promotes tissue healing. Medications should be used under the guidance of a doctor. If the symptoms of mouth ulcers are severe and continue to be unhealed, it is recommended to go to the hospital in time to receive professional treatment.