The presence of pus inside the eye may be a sign of blepharitis on the eyelid. Pus flows into the conjunctival sac after maturation and rupture, or it is a sign of increased purulent discharge from acute conjunctivitis. Therefore, if you find significant pus inside the eye and if there is also a localized red, swollen, and painful lump on the eyelid, consider it to be caused by blepharitis, or mydriasis. Now that the pus has broken down, you need to go to the hospital ophthalmology department to check whether the pus is thoroughly discharged, and then consider local treatment with antibiotic eye drops as well as eye ointment. If there is mild redness and swelling of the eyelids, but no local pressure painful lumps, consider the possibility of acute conjunctivitis. In the presence of purulent discharge, the most common pathogens are Neisseria gonorrhoeae and meningococcus. In the case of neonatal Neisseria gonorrhoeae conjunctivitis, aggressive treatment is required. In severe cases, it may be complicated by corneal ulceration or even endophthalmitis. Pressure on the inner corner of the eye will result in significant drainage and may also be inflammation of the lacrimal sac, requiring irrigation of the tear ducts at the ophthalmology department.