What is the correct distance to hold a Woods lamp from the skin?

What is the correct distance to hold a Woods lamp from the skin?

When using a Woods lamp for skin examination, the correct distance to hold the lamp from the skin is typically around 10-30 cm (4-12 inches). Some sources suggest holding the lamp 4 to 5 inches (10-12.7 cm) away from the skin. The lamp should be held parallel to the skin to ensure proper illumination and visibility of any fluorescence. This distance allows for optimal examination of the skin while minimizing potential interference from external factors. Always ensure the room is completely dark and allow your eyes to adapt to the darkness before conducting the examination.

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