Gaiter area of the leg is the area extending from just above the malleolus to below the knee and tends to occur on both lateral and medial aspect of the leg.The importance of this area is because 95% of venous ulcers occur in this area [1].

References:

Grey JE, Harding KG, Enoch S. Venous and arterial leg ulcers. BMJ : British Medical Journal. 2006;332(7537):347-350.