A Wood’s lamp is a small handheld device that uses black light to illuminate areas of your skin. The light is held over an area of skin in a darkened room. The presence of certain bacteria or fungi, or changes in the pigmentation of your skin will cause the affected area of your skin to change color under the light. Some of the conditions that a Wood’s lamp examination can help diagnose include: Tinea capitis Pityriasis versicolor Vitiligo Melasm.

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