Our expert says:
The sores are called venous/stasis ulcers and is caused by the damage to the blood flow in the leg due to previous deep vein thrombosis. Read more on http://www.patient.co.uk/health/Venous-Leg-Ulcers.htm
There are specialized dressings available for these kinds of ulcers so if possible, see if you can find a specialized wound care clinic in your area. Take vit C supplements. Sometimes a compression stocking is not enough and one should use special compression bandage for a while
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