If swelling in the under-eye area results from an allergic reaction, taking an over-the-counter (OTC) allergy medication, such as diphenhydramine (Benadryl), may help reduce the swelling.

When your body lacks hydration, your skin may look pale, resulting in the darkening of the under-eye area. Allergies: An allergic reaction under the eyes could also be a reason for skin darkening.