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To obtain a skin scraping for microscopic examination, use a soft spiral Pap smear brush instead of a scalpel and rub along the leading edge of the rash. Hold the brush down on a glass slide,and place a drop of KOH on it to transfer the sample.The brush will pick up plenty of skin cells for examination and avoids any possibility of nicking the skin with a scalpel.
— Joanne K. Wills, MD, Baltimore (114-29)

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