Extensive Rash

A 35-year-old male came to the clinic complaining of a persistent rash for the last three weeks, which started gradually and got worse. It initially appears on his trunk and extremities and progressively spreads to his face. He also reports tiredness and facial swelling, especially around the eyes. Denies any recent travel, changes in his diet or personal care products. He has no significant past medical history other than epilepsy, for which he is taking phenytoin. Vital signs are normal except for 39.2°C Temp. His physical examination reveals a deep red erythematous maculopapular rash with vesicles on his chest and upper extremities with facial swelling and periorbital sparing as shown in the image. The lab results show leukocytosis with eosinophilia, elevated liver enzymes, and atypical lymphocytosis. Which of the following diagnoses is most likely,