Q. A 62-year-old man comes to the physician’s office for itching and discoloration of the skin on his left ankle for the past 6 months. He says that the itching is intense after having a shower and he gets relief by applying emollients. He also feels heaviness in both legs and gets throbbing leg aches at night. He is a known diabetic and hypertensive on regular treatment. His temperature is 98.6°F (37°C), pulse is 90/min, blood pressure is 128/80 mmHg, and respirations are 14/min. Physical examination shows a large eczematous, lichenified, and hyperpigmented plaque on the medial side of the left ankle with mild edema. Varicosities are present in both lower limbs. No lymph nodes are enlarged. The rest of the examination is unremarkable. What is the most likely diagnosis in this patient based on the above clinical features?