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.