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A biopsy punch is a specialized medical tool used primarily in dermatology and other fields of medicine for the precise extraction of tissue samples for diagnostic evaluation. It typically consists of a cylindrical metal tube with a sharp cutting edge at one end and a handle at the other. Biopsy punches come in various sizes, ranging from 1 mm to several millimeters in diameter, allowing healthcare professionals to select the appropriate size based on the size and location of the tissue sample needed.