It can be unsettling to see blood blisters in your mouth. Luckily, blood blisters are not a serious condition and often disappear within several days. Cold sores and fever blisters are caused by herpes simplex virus type 1 (HSV-1). This virus is passed from person to person by saliva (either directly, or by drinking from the same glass or cup) or by skin contact. Cold sores usually appear as clusters of tiny blisters on the lip. About 8 out of 10 Mouth sores are common ailments that affect many people at some point in their lives. These sores can appear on any of the soft tissues of your mouth, including your lips, cheeks, gums, tongue. A blood blister in the mouth is often caused by cheek biting or some other trauma inside the mouth. Blood blisters that occur on the roof of your mouth, tongue, or cheek are red in color and filled with blood and other fluids. Hand-foot-and-mouth disease, or HFMD, is caused by a virus. Symptoms include ulcers, or sores, inside or around the mouth, and a rash or blisters on the hands, feet, legs, or buttocks. Blood blisters, canker sores, and fever blisters can all appear in the mouth, and they are typically red in color. There are differences, however. Blisters should heal on their own within a week. They can be painful while they heal, but you shouldn't need to see a GP. How you can treat a blister yourself Canker Sores. No one knows what causes these small, painful blisters inside your mouth. Triggers include hypersensitivity, infection, hormones, stress, and not getting enough of some vitamins. Your tongue might seem small and innocuous, but it plays a substantial role in your everyday life. In addition to speech and taste, it's often a primary indicator of your overall health. Your tongue is also remarkably uncomfortable when indisposed, and sores or tongue blisters can inconvenience you Blisters in the mouth are usually a case of an oral ulcer. Use of clove oil and ginger act as a disinfectant and anti-inflammatory on it.