<prompt> Wood lamp is used to diagnose ?PsoriasisTinea versicolorPityriasis rosaeErysipelas  <response>: Ans. is b i.e., Tinea versicolor Diagnosis of TineaVersicolor Examination of scales in 10 KOH shows sho hyphae and round spores Sphagetti and meat ball appearance. Wood lamp shows apple green fluorescence blue-green fluorescence. Skin surface biopsy -- A Cyanoacrylate adhesive Crazy glue is used to remove the layer of stratum coreum on glass slide and then stained with PAS reagent. 