This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skin, Subject name: Medicine
What diagnosis is suggested by the finding on the sole of this patient's foot? 
Select and explain. 
A. Chemical burn, B. Pemphigus, C. Thrombotic vasculopathy, D. Radiation dermatitis
C: Thrombotic vasculopathy
Answer: C: Thrombotic vasculopathy 
Explanation: 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.