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A blacklight, also called a UV-A light, Wood's lamp, or ultraviolet light, is a lamp that emits long-wave ultraviolet light and very little visible light. [ 1 ] [ 2 ] [ 3 ] One type of lamp has a violet filter material, either on the bulb or in a separate glass filter in the lamp housing, which blocks most visible light and allows through UV ...
In asymptomatic cases it is highly recommended to perform both Wood's lamp examination and microscopic analyses of suspected areas. [10] In the case of transient carriers, lack of clinical manifestations is accompanied with low number of M. canis colonies, number of which declines upon re-testing. [10]
Wood's lamp examination will reveal bright green to yellow-green fluorescence of hairs infected by M. canis, M. audouinii, M. rivalieri, and M. ferrugineum and a dull green or blue-white color of hairs infected by T. schoenleinii. [8] Individuals with M. canis infection trichoscopy will show characteristic small comma hairs. [9]
However, a simple side-room investigation with a Wood's lamp is additionally useful in diagnosing erythrasma. [4] The ultraviolet light of a Wood's lamp causes the organism to fluoresce a characteristic coral red color, differentiating it from other skin conditions such as tinea versicolor, which may fluoresce a copper-orange color. [5]
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Stroking the patch elicits no red flare. Only the normal skin would react with a characteristic erythematous response. Examination under a Wood lamp can also reveal the nevus anemicus patch will not emphasize as a patch of vitiligo would. [7]
The "lamp looks weird" trend originated from an old Reddit post by an anonymous user who experienced a lifetime of memories in a span of a few moments after sustaining a head injury.. In the story ...
The diagnosis of pitted keratolysis is based primarily on the physical examination, with recognition of the classic pitted lesions and pungent odor. Dermoscopic examination can facilitate visualization of pits and pit walls. A Wood's lamp may show coral red fluorescence, as seen in erythrasma.