Keratitis is a common ophthalmic disease, referring to inflammation occurring at the corneal part of the eye. It can be caused by bacterial, viral, fungal, amoebic infections, or autoimmune reactions. Patients with keratitis will experience reactive eyelid edema and conjunctival swelling. In terms of treatment, it is first important to avoid rubbing the eyes, as this can exacerbate the swelling. Alternatively, applying a cold towel can help reduce swelling. Cold compresses lower the temperature of eye tissues, causing the capillaries to constrict and thereby reducing the leakage of fluid into the tissue spaces, which facilitates the reduction of eye swelling. Generally, after cold compresses and anti-infection treatments, the inflammation in the eye will completely subside, and the swelling will disappear.