Do you recognize these ring-shaped lesions?

Do you recognize these ring-shaped lesions?

Figure 1 Quiz of the Week A 69-year-old woman with a history of hypertension and irritable bowel syndrome presents with multiple ring-shaped lesions on both hands. The lesions are non-pruritic and developed over the past four days. When she visits for follow-up two weeks later, the lesions remain present.    Original image posted by @osler1982….

Why did these lesions appear?

Figure 1 Quiz of the Week A 58-year-old woman presents two days after a cardiac catheterization with malaise, fatigue, and new violaceous livedoid lesions on her feet. She is also found to have mild acute renal dysfunction.   Image credit: @hfehmi.   Answer: Cholesterol embolization syndrome When small particles of atheroma embolize during a vascular…

What substance is associated with this presentation?

Figure 1 Quiz of the Week A 45-year-old female presents with painful lesions on her lower limbs and ears. She is a smoker, and has a history of recreational drug use. Purpuric, necrotic lesions are noted on both lower extremities, in addition to tender purpura on both ears. A biopsy is performed which demonstrates leukocytoclastic…