<prompt> A 60-year old patient presented with several bullous lesions for the last 3 days; each bulk was surrounded by an erythematous halo. There were multiple target lesions. The patient also had oral erosions. The most likely diagnosis isChicken poxHerpes simplexHerpes zosterSteven Johnzon syndrome  <response>: This patient has :-i Target lesionii Mucosal involvement oral erosionIt has already been explained that erythema multiforme syndrome has two subtypes -Erythema multiformSteven - Johnson syndrome - toxic epidermal necrolysis complex SJS - TEN complexMucosal involvement oral lesions is common in SJS - TEN complex, whereas it is uncommon in erythema multiforme in less than 20 of patients.So, amongst the given options answer is Steven - Johnson syndrome. 