Final answer:
Edema is the swelling of a part of the body due to accumulated interstitial fluid. It is caused by water leakage from blood capillaries and can be seen as swelling and stretched, tight skin.
Step-by-step explanation:
Swelling of a part of the body due to accumulated interstitial fluid is called edema. Edema occurs when excess water leaks from blood capillaries and accumulates in the tissues. It is most commonly seen in the soft tissues of the extremities and can cause swelling and stretched, tight skin.