PMC5803737_01
Erythematous to violaceous plaque with central necrotic core and faint surrounding collarette of scale on the right lower leg. Photo: courtesy of Dr. Avery LaChance. A 3-mm punch biopsy was performed on the right leg.
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F1
On examination, there were 2 round, red, firm nickel-sized plaques with a central violaceous, necrotic core and collarette of scale on the right lateral lower leg and right medial ankle (Fig. 1).