You are evaluating a foot wound. The left foot has a toe that is gangrenous, and the skin on the dorsum of the foot is shiny, thin, pale, and dry. The wound is shallow, well-defined, and has a punched-out appearance. What type of ulcer are you observing?
1. Venous insufficiency
2. Pressure
3. Arterial insufficiency
4. Trophic
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