Clear blisters on the inside of your mouth are not recommended to be poked and prodded. Instead, you should seek medical attention as soon as possible to figure out the cause of the clear blisters.
If the clear blisters are caused by biting hard objects and rubbing against the mucous membranes, the blisters are usually small and can be left alone for a few days before they naturally disappear.
If the clear blisters appear due to oral mucous gland cysts, you need to go to the hospital as soon as possible and ask the doctor to evaluate whether surgical removal is needed. Because this kind of blister is not only on the surface part, there are also some cysts under the mucous membrane, some patients need to be surgically removed.
In any case, in either case, it is not recommended to poke the clear blisters, as repeated irritation may aggravate the condition. It is still recommended that the patient seek medical attention as soon as possible and ask the doctor to make a judgment.