<prompt> Which of the following is done for the quick diagnosis of Erythrasma-BiopsyKOH examinationCulture and sensitivityWoods lamp examination  <response>: Ans is d i.e. Woods lamp examination o Erythrasma is caused by infection by Coryneform bacteria. Woods lamp examination is a commonly used test to diagnose Erythrasma. Lesion shows coral red fluorescence due to coproporphyrin III production by the bacteria.ConditionFluorescent coloursTinea capitisBright yellow greenErythrasmaCoral red or pinkVitiligoMilky whiteAlbinismBlue whiteLeprosyBlue whiteTuberous sclerosisBlue whitePseudomonas infectionGreenish whitePorphyriaPinkorangeTinea versicolorGolden yellow 