<prompt> A 36 years old factory worker developed itchy annular scaly plaques in both groins. Application of a corticosteroid ointment led to temporary relief but the plaques continued to extend at the periphery.The most likely diagnosis isErythema annulare centrifugamGranuloma annulareAnnular lichen planusTenia cruris  <response>: In this question :-Annular lesion in groinsScalyItchingExtending peripheriallyAll suggest the diagnosis of dermatophyte infection.Dermatophyte infection of groin is known as T. cruris. 