A pustule in the eye may be caused by blepharitis, blepharoconjunctival cyst secondary infection, conjunctivitis and other diseases, which can be treated by medication or surgery under the guidance of a doctor. 1. Blepharitis: usually refers to acute suppurative inflammation of the eyelid glands, due to the stimulation of inflammation, it will lead to the phenomenon of a pustule in the patient’s eye. You can use levofloxacin eye drops, erythromycin ophthalmic ointment and other medications under the guidance of a doctor for treatment, and if necessary, incision and drainage of pus. 2. Blepharoplast cysts secondary infection: Blepharoplast secretion is blocked, secretion retention is easy to secondary infection, thus the phenomenon of a pus bag in the eye. Patients can use erythromycin ophthalmic ointment and other drugs under the guidance of the doctor for treatment. If the effect of medication is not good, surgical excision can be taken for treatment. 3. Conjunctivitis: usually due to bacterial infection, immune response and other factors, due to inflammation stimulation, will lead to conjunctival congestion, edema, so it looks like a pus bag in the eye. Patients can be treated with drugs such as levofloxacin under the guidance of a doctor. The appearance of a pus in the eye may also be other reasons, it is recommended that timely medical examination, and under the guidance of the doctor to identify the cause of the disease to take targeted treatment.