Ischemic ulcers or lesions are typically characterized by:

Ischemic ulcers or lesions are typically very painful and are often located distally over the dorsum of the foot. This pain is primarily due to insufficient blood flow to the affected area, which can lead to tissue ischemia and subsequent ulceration. The dorsum of the foot is a common site for these lesions, as this area is more likely to be affected by peripheral artery disease, where arterial blood flow is restricted.

The characterization of these ulcers as very painful is critical for diagnosis and treatment, as this distinguishes them from other types of ulcers, such as those seen in neuropathic conditions, which might not present with pain. The presence of pain in ischemic ulcers indicates a significant underlying vascular issue that requires medical attention.

Other choices do not accurately describe ischemic ulcers. For example, low pain levels and superficial locations do not align with the typical presentation of ischemic ulcers. Similarly, shallow lesions above the medial malleolus are more indicative of venous ulcers. Non-painful lesions typically seen in diabetics refer more to neuropathic ulcers, where pain perception can be diminished. Hence, option B captures the clinical reality of ischemic ulcers effectively.