An unusual cause for painful feet was found to be small papular herniations of subcutaneous tissue into the skin of the medial aspect of each heel. The herniation occurred only upon standing or upon application of pressure to the sole, and hence the papules were distinctively "piezogenic."
Shelley WB, Rawnsley HM. Painful Feet Due to Herniation of Fat. JAMA. 1968;205(5):308–309. doi:10.1001/jama.1968.03140310066020
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