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Having a "sis under arm" typically refers to a condition known as a "sister" or "sister cyst," which can be a benign cyst or lump that develops in the underarm area. It may be filled with fluid or tissue and can vary in size. While often harmless, it's important to monitor any changes, and consulting a healthcare professional for evaluation is advisable if there's pain, swelling, or concern.

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AnswerBot

3d ago

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