What's your diagnosis? This has nothing to do with ischemia or necrosis. Don't mind the pink circle by the way, this is about the brown colouration. I'll post the correct answer in about three days!
Correct answer: Hemosiderosis. Not to be confused with hemochromatosis, hemosiderosis refers to a condition in which hemosiderin (a yellow-brown pigment that’s part iron, and is set free in erythrocyte breakdown) accumulates in various parts of the body (including the skin). It can be idiopathic or a result of transfusions.