Oral rot may have the following reasons: 1, suffering from herpes stomatitis, the disease is due to infection caused by herpes simplex virus, mostly occurring in the alternation of seasons or people with colds, fever and other immune deficiency, the main symptom is that the surface of the oral mucosa will appear a lot of small pinhead-sized blisters, blisters of blisters with a thin wall, especially prone to rupture, blisters will be broken, leaving a large swath of congestion, redness, vesiculosity of the mucosal surface. 2, with fungal infection stomatitis, the disease is due to the body infected with Candida albicans caused, mostly in the frail children or the elderly, the main symptom is the appearance of white plaques in the oral cavity, the course of the disease is serious white plaques will be connected to a piece, the formation of a white pseudomembrane. 3, bacterial infectious stomatitis, the main symptoms are the oral mucous membrane redness, swelling, vesiculation, vesiculation of the surface of the pseudomembrane with a layer of yellow. 4.Multiple places in the mouth with oral ulcers, there will also be the feeling of mouth rot.