A 40-year-old patient complains of malaise, weakness, headache, fever up to 38,5°C. Objectively: there is a symmetric red lesion in form of butterfly-wing rash on the face around the nose and cheeks. The lesion is clearly demarcated, tender on palpation, does not disappear when pressed upon. The skin is raised and glossy. Submandibular and parotid superficial lymph nodes are enlarged, tender to palpation. What is the most likely diagnosis?