A cancerous tumor that develops in the eyelid tissue or the structures of the eyelid.
From Greek 'blepharon' (eyelid) + 'karkinos' (crab, used metaphorically for cancer) + '-oma' (tumor). The root 'karkinos' was chosen by ancient physicians because cancers spread like a crab's legs, and this term has remained the foundation of all cancer-related medical words.
Eyelid cancers are actually relatively rare compared to skin cancers elsewhere, but they're often caught earlier because people notice unusual lumps or sores near their eyes — ironically, the eyelid's high visibility makes it one of the best places for early cancer detection.
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