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surfer's knot

noun
  1. a tumorlike nodule below a surfer's knee or on the upper area of the foot, caused by pressure on the skin and tissue exerted by the surfboard.
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Also called surfer's knob.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

surfer's knobs in Medicine

surfer's knobs

(sûrfərz)
pl.n.
  1. Tumorlike skin nodules just below the knees, on the tops of the feet, and often on the toes, common among surfers who paddle in a kneeling position.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.