<prompt> What diagnosis is suggested by the finding on the sole of this patients foot?Chemical burnPemphigusThrombotic vasculopathyRadiation dermatitis  <response>: Answer C. Thrombotic vasculopathyThe purpuric skin eruption has a netlike arrangement referred to as retiform. Retiform purpura is an indication of an acute thrombotic vasculopathy. If it is acute and rapidly progressive in a febrile patient, it suggests purpura fulminans. 