A Wood’s lamp is a small handheld device that uses long wave UV light to illuminate areas of your skin. . It can help in differentiating various pigmentation disorders and fungal infections from bacterial infections. The light is held over an area of affected skin in a darkened room.
Some of the conditions that a Wood’s lamp examination can help diagnose include tinea capitis, pityriasis versicolor ,vitiligo, melasma ,erythrasma.
It is a risk free, low cost, bed side investigation.