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2. Pitting

When a person has edema, pressing on a swollen section may leave behind a small dent. This is because the fluid is taking up most of the space under the skin and takes time to flow back. Medical experts refer to these dents as "pits" and the characteristic as "pitting." This is one way that doctors can determine treatments. They measure the depth of a pit and how long it takes to rebound. They then grade it on a scale from one to four, which allows them to better customize treatment options. Experts specifically refer to this type as pitting edema.

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