Abnormal discoloration or dark pigmentation of the eyelid skin, often appearing as patchy or uneven coloring.
From Greek 'blepharon' (eyelid) + 'dys-' (abnormal or difficult) + 'chroia' (color or complexion). The prefix 'dys-' indicates abnormality, and this term emerged in dermatology and ophthalmology to describe color irregularities.
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