Posted by: shirish February 22, 2010
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By the looks, it is a "mucocele" - a blockage of the minor salivary glands.
You may or may not be traumatizing the area by sucking or brushing or eating, and for some reason the orifice of the minor salivary gland got blocked and the salivary production got accumulated instead of drainage. There are more than 600 minor salivary glands in the oral cavity and the ones inside the lips are most frequently affected.
There is no treatment and usually it gets ruptured and when the fluid drains, you may get a salty taste in your mouth. To prevent secondary infections, you have to keep your mouth clean.
If it gets recurrent and bothers you, removal (surgical) of the minor glands may be an option, but I do NOT think you will need it. It usually gets resolved by itself. If it gets too big, you may puncture or it gets ruptured itself.
Saliva itself has lysine so application of extra lysine may not be beneficial. Don't bother applying lysine.
SLS, detergent in toothpastes, may cause ulceration and what you have is a blister so you do not have to worry about SLS causing it.
So don't worry and keep us posted. Hope this helps.