If the eye is allergic to the eye will be red, swollen, itchy, and even oozing, peeling, if applied saline because the saline will cause pain to the broken skin irritation, and even make the swelling feel worse, so eye allergy, redness, itching is not recommended to apply saline, you can use anti-allergy eye drops, eye ointment local drops, like the common Olopatadine eye drops can be used topically. If the redness and swelling is strong, you can use hormonal eye drops topically to temporarily reduce swelling and itching, such as D&B eye drops and Flumeon eye drops to treat. The main thing is to get rid of the allergen. The allergy can be detected by allergen testing, and the eye needs to be treated with topical anti-allergy medication.