Allergies can cause swollen eyes and are a normal part of an allergic reaction. This condition can be seen in allergic conjunctivitis, contact blepharitis, and the symptoms usually manifest as redness and swelling of the eyelids with a distinct itchy sensation. In this case, it is recommended that an etiological examination be performed to clarify the specific allergen causing the allergy and to avoid this environment. If the examination is unclear, local cold compresses can be given to effectively reduce the local swelling, and systemic and local anti-allergy treatment can be applied, such as local sodium cromoglycate eye drops, azelastine hydrochloride eye drops, olopatadine eye drops, and flutemetron eye drops, etc. Systemic oral loratadine can be given. The characteristic of allergic reactions is that they come quickly and recover very quickly.