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What causes blisters on the mouth?

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Quick Answer

Causes of mouth blisters include trauma, fever and food allergies, according to HealthGuidance. Understanding the cause of these blisters helps guide the process of seeking the right treatment.

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Trauma is the most common cause of mouth blisters, states HealthGuidance. The injury usually results from biting the inside of the lips or cheeks while eating, by accident or as a nervous reaction. This type of blister usually heals on its own after a few days. If it persists, HealthGuidance suggests chewing basil leaves or applying basil paste to the blister three times daily.

Herpes simplex virus type 1 causes more than 95 percent of recurring fever blister outbreaks, states the National Institute of Dental and Craniofacial Research in a paper published by Publications.USA.gov. The virus is contagious, often spread by kissing. Blisters appear in the mouth three to five days after infection. General aches, fever and swollen neck glands accompany the fluid-filled blisters. Blisters often merge and form a yellowish crust over the resulting mouth sores.

Some irritants that cause mouth blisters include hot or spicy foods, explains HealthGuidance. To identify a particular irritant or food allergy, patients can try an elimination diet, doing away with particular foods to see whether the blisters disappear. A health care specialist can rule out herpes simplex, making a food allergy a high probability.

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