Cassandra Kennedy

A 58-year-old morbidly obese female patient with uncontrolled diabetes and peripheral arterial disease presents with an open wound to the central plantar aspect of her foot. She reports no pain, does not recall an injury, and is not sure how long she has had the ulcer. On exam, there is a 3.5 cm circular wound with thick yellow material in the center, and the edges of the wound are pink and warm to the touch. What is the diagnosis, and what are your next steps?