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My name is***** and I would like to assist with your question. Although the addition of benedryl will not be harmful, it likely will not provide any additional relief than what the steroid provides. Typically issues with the eye that involve swelling need to be examined and have topical medication applied directly to the eye.
The eye can also be rinsed with sterile saline like contact solution to help facilitate rinsing the eye of any allergens that can be irritating the surface.
If the steroid he is on is prednisone, you can give 1 25 mg benedryl capsule in addition to this.