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A sign of venous occlusion is characterized by specific changes in the affected limb due to impaired venous blood flow. In this context, leg erythema and warmth indicate that there is an issue with venous return, leading to pooling of blood in the extremities. As the blood gathers, it can increase pressure in the veins, resulting in increased capillary permeability and causing the skin to become warm and reddened in appearance. This is typically associated with conditions such as deep vein thrombosis (DVT) or other forms of venous insufficiency, where the normal return of blood to the heart is disrupted.

On the other hand, factors such as a cool extremity or pallor when elevated would typically suggest arterial occlusion or reduced blood supply rather than issues related to venous drainage. Non-healing ulcers can indicate chronic venous insufficiency, but they are not immediate signs of acute venous occlusion. Thus, leg erythema and warmth are directly indicative of the pathophysiological changes that occur due to venous obstruction, making this response clear and relevant in identifying venous occlusion.