Small red bumps on the lower eyelids of infants may be caused by conjunctivitis or blepharitis. 1. Conjunctivitis: Inflammatory disease of the conjunctival tissue caused by infection, immune lesions and external stimuli, infants will have red eyes, itchy eyes, small red bumps locally and other symptoms, can be treated with tobramycin eye drops, azithromycin eye drops and other drugs. 2. Blepharitis: acute purulent inflammatory lesions occurring in the eyelid glands, usually caused by staphylococcal infections, infants will appear local redness, swelling, heat, pain, small red bumps on the lower eyelids and other symptoms, can be treated with ofloxacin ophthalmic ointment, erythromycin ophthalmic solution and so on. Therefore, infants with small red bumps on the lower eyelids should go to the hospital as soon as possible, and actively cooperate with the doctor after clarifying the cause of the disease.