Swelling of the eyelid caused by fluid accumulation in the eyelid tissues, often resulting from allergies, infection, or systemic disease.
From Greek blephara (eyelid) + edema (swelling). Edema refers to abnormal fluid accumulation, making this term a straightforward description of puffy eyelids.
Blepharedema sounds scary but it's just medical-speak for puffy eyes: the same swelling you get from crying, allergies, or not sleeping, though when it's extreme it can signal thyroid disease or kidney problems—so sometimes fancy terminology hides important warnings.
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