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Mehmet Oz, MD, Cardiology, answeredPull down your lower eyelid and look in the mirror. If you notice little bumps inside the eyelid that look like cobblestones, it's a telltale sign of allergies. Some of the most common culprits are dust, pet dander, and mold. To combat allergies, try using a HEPA filter in your home and keeping your beloved pooches and kitties out of your bedroom -- or, at least, off the bed.