Although doctors have not pinned down an exact cause for canker sores, some speculate that trauma to your saliva ducts actually causes these types of mouth sores.

For example, some experts believe that when saliva ducts are damaged through contact with a sharp object or are bitten, they can cause the mouth to produce saliva that gets trapped under the traumatized tissue. If this occurs, saliva builds up, creating a mouth blister.

Luckily, canker sores are not contagious and you can take steps to get rid of mouth blisters.

EASY HOME REMEDIES FOR CANKER SORES

Try the following methods for getting rid of mouth sores quickly and easily.

Rinse Mouth with Salt Water: Salt tends to sanitize the mouth and draw out impurities from the sores. Try rinsing with warm salt water several times a day.

Rinse Mouth with Hydrogen Peroxide: This method is effective, but may sting a little. Be careful not to swallow the chemicals!

Rise Mouth with an Antimicrobial Mouthwash: A good mouthwash can also clean up the sores in your mouth. Try Listerine or a similar product.

Apply Ice to Sores: Mouth blisters can get temporary relief from having ice pressed on them for several minutes. This is not a long-term solution.

Coldsores are generally found around the outside of the mouth (though they can occur on the roof of the mouth or along the gums) and are caused by the herpes simplex virus I and breakout occurrences can be increased by the presence of a weakened immune system (resulting from a variety of factors including stress).  Coldsores are extremely contagious. Treatments include over-the-counter and prescription creams as well as oral medications such as Valtrex.  Using a lip covering gel such as Carmex can provide some relief from commonly associated itching and burning.

Canker sores are generally found inside the mouth. They are caused by a variety of factors including bacterial infections, food allergies, stress, nutrition deficiencies, and ultraviolet light. Unlike coldsores, they aren’t contagious.  Treatment can include using a liquid ointment to numb the mouth in order to relieve pain. With moderate to severe canker sores, steroids can be prescribed as a treatment.

For both coldsores and canker sores, sometimes the best remedies for mouth blisters is to prevent their occurrences all together. Both types of mouth blisters can be caused by stress, trauma, and / or ultraviolet light, so seeking to minimize these as much as possible can go a long way towards prevention.