A clear blister on the eyelid may be caused by blocked eyelid glands, shingles on the eyelid or allergies. 1. Eyelid gland obstruction: patients can see small bubbles on the surface of the eyelid due to eyelid gland obstruction or eyelid skin contact with pathogenic bacteria, such as bacteria or viruses, infected as blepharitis or blepharitis. 2. Herpes zoster virus: the eyelid is invaded by herpes zoster virus, the disease may also be manifested in the early stage of herpes on the eyelid as well as the surrounding skin, and in the later stage, there may be ulceration, crusting and other symptoms. So it will lead to the growth of transparent vesicles on the eyelids. 3. Allergic factors: it may be caused by allergy, because the eyelids are relatively thin, if after the stimulation of allergy, there is some accumulation of fluid under the skin, we feel that there are small bubbles on the eyelids. If there is no relief for a long time, you should go to the ophthalmology department of the hospital in time.