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Yes, the redness is a sign of inflammation. It can be caused by bacterial infection. In that case the ulcer would smell badly or be covered with yellowish discharge. It can be caused by lack of oxygen, too. It is important to bandage the leg to accelerate the blood flow in the deeper veins and thus enable the arteries to bring fresh blood into the leg.
You don't have to fear clotting under this medication.
How is your grandma doing now?
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