Areas of tissue in the body that have been damaged by disease or injury.
From Latin 'laesio' meaning 'injury' or 'damage,' derived from 'laedere' meaning 'to hurt.' The term entered English medical vocabulary in the 14th century to describe visible wounds or abnormal changes in body tissue.
Lesions are like the body's error messages—they can tell doctors exactly what went wrong, whether from infection, trauma, or disease, making them crucial clues in diagnosis before modern imaging even existed.
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