Whether to apply hot or cold compresses to swollen eyes depends on the cause of the swelling and the time of the swelling. If the eye swelling is caused by trauma, similar to a broken foot, cold compresses are usually recommended within 48 hours to reduce the exudation of tissue fluid, while hot compresses are recommended after 48 hours to promote the absorption of tissue fluid and reduce swelling. If the swelling of the eye is caused by inflammation, usually accompanied by pain, hot compresses are not recommended in the acute phase of this condition. Because it may promote the spread of inflammation until the redness and swelling gradually subsides, then consider applying hot compresses, which can promote the absorption of pus. If the eye swelling is caused by allergy, usually edema and painless, this situation can improve the symptoms and reduce the exudation of tissue fluid by considering cold compresses.