This has come up in Question 14.2 from the second paper of 2010.
The question ("What the hell is this?") was accompanied by an image which resembles the one below:
That is purpura fulminans, resulting - in this case - from menigococcal sepsis.
The image was stolen shamelessly from www.unboundedmedicine.com to replace the college's proprietary purpura picture.
A less florid (and therefore more common) appearance in an asplenic adult can be seen below:
If this ever comes up again, it is likely that the college will expect the candidates to generate a list of differentials to explain this appearance.
Gürses, Nuran, and Ismail Ilek. "Causes of purpura fulminans." The Pediatric infectious disease journal 14.6 (1995): 552.
Spicer, Thomas E., and Jerold M. Rau. "Purpura fulminans." The American journal of medicine 61.4 (1976): 566-571.
Chalmers, E., et al. "Purpura fulminans: recognition, diagnosis and management." Archives of disease in childhood 96.11 (2011): 1066-1071.