A 59-year-old tailor came to the clinic complaining that one of the moles on her left shoulder seemed larger than usual. It has also started to itch. She first noticed the lesion seven weeks ago while bathing. She denies anorexia, weight changes, or malaise, though he admits to feeling somewhat tired in the past couple of months. On examination, she is well appearing and has no lymphadenopathy. The lesion is darkish brown, 16 mm in diameter, located on mid-back in close approximate to the lateral margin of left scapula, is nodular and round with a small area of ulceration. There is no bleeding. Which of the following is the proper diagnosis,