Ulcer or blister?: An ulcer would be described as a crater. This is best treated with 50% mixture of water and hydrogen peroxide rinses for 2 minutes 3x per day. A blister is fluid filled.Rinse with 1/2 tsp of salt in 5 oz cup of water for 2 minutes 3 x per day do not pop.
Answered 8/27/2017
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