A 22-year-old man came to a dentist with complaints of increased salivation and a sharp pain in the oral cavity during eating and talking. He notes the acute onset of the disease that occurred after an overexposure to cold, high body temperature (39,5°C), general weakness, and headache. He has a history of chronic tonsillitis and is allergic to certain medicines. On examination his skin is pale. On the dorsal surface of his hands there are bluish-pink rashes with a hemorrhagic crust in the center. Vermilion border of the lips is swollen and covered in hemorrhagic crusts. Regional lymph nodes are enlarged, painful, and mobile. Make the provisional diagnosis: