A 49-year-old male patient consulted a dental surgeon about an enlarging "mother's mark", itch and desquamation. According to patient, changed in color and size skin area appeared a year ago after a shaving trauma. Objectively: there is an intensely pigmented brown spot up to 2 cm large with small oval protruding nodules on its surface in the infraorbital region on the left. Desquamation factors are present. Palpation is painless. Regional lymph nodes are matted together with skin and painless. What is the most likely diagnosis?