Recurrent blister on gums afflict about 20 percent of the general population. The medical term for the sores is aphthous stomatitis. Blister gums are usually found on the movable parts of the mouth such as the tongue or the inside linings of the lips and cheeks. They begin as small oval or round reddish swellings, which usually burst within a day. The ruptured sores are covered by a thin white or yellow membrane and edged by a red halo. Generally, they heal within 2 weeks. Blister on gums range in size from an eighth of an inch wide in mild cases to more than an inch wide in severe cases. Severe canker sores may leave scars. Fever is rare, and the sores are rarely associated with other diseases. Usually a person will have only one or a few canker sores at a time. Most people have their first bout with canker sores between the ages of 10 and 20. Children as young as 2, however, may develop the condition. The frequency of canker sore recurrences varies considerably. Some people have only one or two episodes a year, while others may have a continuous series of canker sores.

Causes of blisters on gums

The cause of canker sores is not well understood. More than one cause is likely, even for individual patients. Canker sores do not appear to be caused by viruses or bacteria, although an allergy to a type of bacterium commonly found in the mouth may trigger them in some people. The sores may be an allergic reaction to certain foods. In addition, there is research suggesting that canker sores may be caused by a faulty immune system that uses the body's defenses against disease to attack and destroy the normal cells of the mouth or tongue. Female sex hormones apparently play a role in causing canker sores. Many women have bouts of the sores only during certain phases of their menstrual cycles. Most women experience improvement or remission of their canker sores during pregnancy. Researchers have used hormone therapy successfully in clinical studies to treat some women. Both emotional stress and injury to the mouth can trigger outbreaks of canker sores, but these factors probably do not cause the disorder.

Susceptible

Women are more likely than men to have recurrent canker sores. Genetic studies show that susceptibility to recurrent outbreaks of the sores is inherited in some patients. This partially explains why family members often share the disorder. Most doctors recommend that patients who have frequent bouts of canker sores undergo blood and allergy tests to determine if their sores are caused by a nutritional deficiency, an allergy or some other preventable cause. Vitamins and other nutritional supplements often prevent recurrences or reduce the severity of canker sores in patients with a nutritional deficiency. Patients with food allergies can reduce the frequency of canker sores by avoiding those foods.

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