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úlcera
An area of tissue erosion, for example, of the skin or lining of the gastrointestinal (GI) tract. Due to the erosion, an ulcer is concave. It is always depressed below the level of the surrounding tissue. Ulcers can have diverse causes. Ulcers on the skin are often due to irritation, as with bedsores, and they may become infected and inflamed as they grow.
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