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Wood’s lamp examination

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The Wood’s lamp is a device that emits ultraviolet rays but includes a filter of barium silicate to exclude visible light. It is easy to use but is much less reliable in darker skin types because of the high levels of melanin present. It requires a completely dark room, and it is important to remember that false positive results can be achieved with scales, soap, residual topical treatment, or dressings. It can be helpful in diagnosis for a variety of dermatological diseases and infections [12]. It is also used to delineate the margins of lesions to be treated with photodynamic therapy after the 5‐ALA cream is applied (see Chapter 8). The conditions that are relevant to the vulva and the results expected are shown in Table 7.1.

Ridley's The Vulva

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