Pigmentation around the medial malleolus with a painless ulcer is most consistent with which underlying vascular problem?

• A. Arterial insufficiency
• B. Venous insufficiency with lipodermatosclerosis
• C. Diabetic neuropathy
• D. Lymphedema

Answer: (B)

Chronic venous insufficiency leads to long-standing venous hypertension that causes leakage of blood components and inflammation in the skin and subcutaneous tissue. The red blood cells leak out and break down, leaving hemosiderin pigment that gives a brownish, pigmented appearance, especially in the dependent “gaiter” zone around the malleoli. Over time this inflammation tightens and hardens the skin and subcutaneous tissue—a process called lipodermatosclerosis. This combination of stasis dermatitis with lipodermatosclerosis creates a predisposition for shallow, painless ulcers to form near the medial malleolus, where edema and venous pressure are greatest.

In contrast, arterial ulcers are typically painful, located at the tips of toes or pressure points, and are associated with diminished pulses and pallor on elevation. Diabetic neuropathy ulcers are usually painless but occur on the plantar aspects of the feet due to loss of protective sensation, not specifically around the malleolus. Lymphedema causes swelling with skin changes from chronic edema but is not characteristically described by this pattern of pigmentation with a unilateral venous ulcer.