Last Gory Medical Challenge Before Christmas

If the New England Journal of Medicine can do it right before Christmas, so can EverythingHealth.  This shocking pic represents what diagnosis?
1.  Ichthyosis
2.  Ischemic gangrene
3. Necrobiosis lipoidica diabeticorum
4. Phlegmasia cerulea dolens
5. Pyoderma gangrenosum

Make your diagnosis in the comment section and check back tomorrow for the answer.
(Better yet...sign up on the right as a