When a clear blister grows in the mouth, the following treatment can be carried out: 1, if the clear blister is caused by eating hard objects rubbing the mucosa, or when a bad restoration in the mouth stimulates the mucosa, a sterile syringe can be used after local disinfection to suck out the liquid inside the blister to promote healing, while paying attention to trimming the edges of the restoration and polishing; 2, if a mucous gland cyst occurs in the lip, a smaller volume of blister can be removed using laser or microwave removal, and larger blisters can be removed under local anesthesia by removing the blister together with the salivary gland, suturing and closing the wound, and removing the sutures in about seven days; 3. When suffering from aspergillosis or aspergillosis-like blisters causing clear blisters, immunity enhancement and hormone application should be targeted at the whole body.