Body temperature of a 12-year-old girl increased up to 39-40°С in 4-5 hours after she had taken 2 pills of aspirin. Complains of general discomfort, dizziness, sudden appearance of red spots on the skin with blister formation or exfoliation of the epidermis with erosive surface. Lesions on the skin looked like burns of II-degree. Nikolsky syndrome is positive. What is the most probable diagnosis?