A 71-year-old Chinese man presented with acute, painful and progressive purpuric patches with haemorrhagic bullae on the lower limbs. These lesions ulcerated and were very slow to heal with eschar formation (Fig. 1). His past medical history included hypertension. He denied any new medications, contactants or illicit drug use. A skin punch biopsy was taken from the foot lesion (Fig. 2). What is your diagnosis?
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