An oral ulcer is the most common cause of a blood blister in mouth. Oral herpes, unknowingly biting the cheek, nutritional deficiency and food allergies too can bring about mouth blisters. An ulcer is an open wound that appears inside the mouth, due to invasion of microorganisms. This skin infection can also occur as a side effect of certain medications. There are generally 2 types of mouth ulcers: cold sores and canker sores. In most cases, mouth blisters, do not need any specific medical treatment, as they go away on their own within a few days. If the blister is painful, pain killers like Tylenol and Motrin can be used.
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