There are many causes of small blisters on the eyelids, including viral infections, bacterial infections, and allergies, as follows: 1. Viral infections: have prodromal symptoms, such as decreased lower resistance, fever, along with the production of eyelid blisters, which are usually very dense and accompanied by severe pain, and can be treated with anti-viral eye ointments. 2. Bacterial infections: are usually accompanied by yellow ooze, accompanied by redness and swelling of the eyelids, and are treated symptomatically with antibiotic-type eye drops and ointments. 3. 3. Allergies: usually accompanied by itching, skin molting and scaling of the eyelids. for allergic eyelid blisters, some anti-allergy eye ointment can be used.