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Leg Swelling: Symptom of Pitting Edema. Leg swelling generally occurs because of an abnormal accumulation of fluid in the tissues of the lower extremity. Persisting indentation of a swollen leg after pressure from a finger is known as pitting edema. Common causes of leg swelling include. salt retention, cellulitis, congestive heart failure, and.
1 Edema is a swelling, usually of the legs, due to the accumulation of excessive fluid in the tissues. 2  The edema that occurs in diseases of the heart, liver, and kidneys is mainly caused by salt retention, which holds the excess fluid in the body.dema most commonly occurs in the feet and legs, where it is referred to as peripheral edema. The swelling is the result of the accumulation of excess fluid under the skin in the spaces within the tissues. All tissues of the body are made up of cells and connective tissues that hold the cells together.