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To the Editor.—
Rawnsley and Shelly, reporting "Painful Feet Due to Herniation of Fat" (JAMA205:110, 1968), referred to the clinical lesions as "piezogenic papules." Following them, I and my co-workers reported the same condition as "Painful Piezogenic Pedal Papules" (Arch Derm101:112, 1970).It has since been pointed out to me by Dr. Morris Leider that "piezogenous" would have been a better word than "piezogenic" to convey the sense of arising from pressure. In his dermatologic dictionary the subtle distinction of "-genic" meaning "giving rise to or producing" and "-genous" meaning "arising from or produced by" is given. It seems useful to me to maintain the distinction in these and similarly paired words.
Gibbs RC. TERMINOLOGY. Arch Dermatol. 1970;102(2):234. doi:10.1001/archderm.1970.04000080106027