Edema

An edema was an abnormal accumulation of fluid beneath the skin.

In 2371, Walter Baxter suffered moderate edema to his arm while working out in the gymnasium aboard the USS Voyager. 

In 2377, Iko suffered severe edema in his parietal lobe following a beating from Yediq that blocked vital neurotransmitters in his brain. The Doctor was able to bypass the edema with the help of some of Seven of Nine's nanoprobes.