Mucositis with targetoid lesions in an adult

A 34-year-old woman without an autoimmune history was started on lamotrigine 10 days ago for unprovoked seizures.She presents with a 2-day history of Nikolsky-negative violaceous papules and plaques of the malar region (Fig 1,A).There were a few macular and atypical targetoid lesions on the trunk (Fig 1, B andC ).The patient had extensive lip and oral erosions with positive antinuclear antibodies (ANA) (titer of 1:160, speckled pattern) and anti-Sjogren's-syndrome-related antigen A (anti-SSA/Ro) antibodies.Extensive testing for viral and bacterial infections was negative.Lesional skin biopsy revealed pauci-inflammatory interface dermatitis with extensive keratinocyte necrosis with a negative direct immunofluorescence study.Question 1: What is the most likely diagnosis based on the clinical presentation, laboratory studies, and histopathology? A. Stevens-Johnson syndrome (SJS) B. Rowell syndrome C.