BRUSH FOR SAMPLING
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)