<prompt> Coral red fluorescence on Woods lamp is seen inErythrasmaErysipelasPityriasis versicolorTinea corporis  <response>: Ans. a Erythrasma Ref. H-17p. 312A Woods lamp generates 360-nm ultraviolet or black light that can be used to aid the evaluation of certain skin disorders. For example, a Woods lamp will cause erythrasma a superficial, intertriginous infection caused by Corynebacterium minutissimum to show a characteristic coral pink color.Color changes in Woods Lamp 360-nm UVConditionsFindingErythrasma C.MinutissimumCoral RedTinea Pityriasis VersicolorDull YellowFrecklesAccentuatedPost inflammatory DermalFadesVitiligoTotally whiteTinea CapitisBrilliant GreenTinea Capitis by Microsporum canisYellowTinea Capitis by M. audouiniYellowPseudomonasPale BlueGreenTuberous Sclerosis Ash LeafBlue whiteUrine in Porphyria Cutanea TardaPinkish RedERYSIPELAS is due to S. pyogenes is characterized by an abrupt onset of fiery-red swelling of the face or extremities. Infants and elderly adults are most commonly afflicted. The severity of systemic toxicity varies. The distinctive features of erysipelas are well-defined indurated margins, particularly along the nasolabial fold; rapid progression; and intense pain. Flaccid bullae may develop during the second or third day of illness, but extension to deeper soft tissues is rare. Treatment with penicillin is effective. 