Test your diagnostic skills in our regular dermatology quiz. What is the cause of this circumferential ulceration with necrosis occurring on a man’s finger?
A 38-year-old man presents with acute painful ulceration of his right ring finger that has developed over the past five days. He denies any trauma or chemical exposure to the affected skin. He does not have any allergies and is not taking regular medications. He works in information technology and is right-hand dominant.