A 36-year-old man complains of an ulcer on his lower left lip. Three weeks ago a smal round red spot appeared on his lip. Eventually it became more dense and noticeable and 2- 3 days ago developed an ulcer in its center, while under the lower jaw appeared multiple painless nodules. Objectively on the mucosa of the lower left lip there is an oval ulcer, I. 2 cm in diameter, with smooth clear margins and bright-red glossy floor. Ulcer edges form a cushion that smoothly descends to the bottom of the ulcer. In the base of the ulcer there is a dense painless infiltration. Submandibular lymph nodes are enlarged and painless, the skin over them remains unchanged. This clinical presentation corresponds with the following disease: