KIAWAH ISLAND, S.C. — A thorough workup should be conducted when determining the cause of bilateral eyelid swelling, according to a speaker at Kiawah Eye & Retina.“The differential diagnosis for bilateral lid swelling is incredibly large,” Susannah L. Brown, MD, said during a presentation. “It could be ... infectious, inflammation, allergic, neoplastic, traumatic or age-related.”Common causes of bilateral eyelid swelling include bilateral preseptal cellulitis, bilateral dacryocystitis, inflammatory disease, thyroid eye disease, blepharitis or angioedema, Brown said in the presentation.