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A mucocele usually appears more like a bump on the lip rather than generalized swelling, but they can vary in appearance. Mucoceles are cysts that occur from biting the lip or trauma to the lip that results in damage to a salivary gland. Fluid then backs up or pools under the skin in that area and forms a bump. 
Burning mouth syndrome treatment baking soda

You can either apply apple cider vinegar or white vinegar to the sun blisters to absorb the heat from the burned skin, relieve the burning sensation and accelerate the healing process. Directly spray either of the vinegars on the sunburn blister. 
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