Small blisters on the inner eyelids are usually caused by the following factors: 1. Due to infectious factors, the inner surface of the eyelids is covered with conjunctival tissue. When conjunctivitis occurs, the lymphocytes in the conjunctival tissue gather and proliferate, resulting in small blisters that protrude from the conjunctival surface called follicles and papillae, which can subside on their own when the inflammation is cured. 2. Due to lid gland cysts, the lid gland secretes a large amount of oil components that make up the lipid layer in the tear fluid. 3. due to conjunctival lymph node cysts, when the return flow of conjunctival lymph fluid is blocked, small cysts are formed, which appear as small, raised, clear blisters.