<prompt> A 24 year male came to OPD with brownish itchy patches in axilla, blood lamp examination shows coral red fluroscence. Most likely diagnosis is:Tenia corporisHidradenitis suppurativaErythrasmaTinea crusis  <response>: Erythrasma is caused by Corynebacterium.minutissimum characterized by intense itchy brownish red patches in axilla and groin , which on wood lamp examination shows characteristic coral red fluorescence. 