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First of all, I am NOT a doctor. Secondly, going by my personal experience of 55 years, there are a few possibilities. It could be a: 1) Cyst (ganglion or otherwise) 2) Carbuncle (another type of growth) 3) Fatty deposit I must stress the importance of seeing a qualified MD to properly diagnose this condisiton. A good dermatologist would be a perfect choice. Lastly, do NOT pick at or try to lance (cut) this growth as it could have a good supply of blood vessels around it and you could cause serious bleeding. Good luck and get to that doctor!!!!

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Q: What could a large swollen knot under the skin on the arm be?
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