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Hairs of various kinds may become impacted in the weight-bearing surfaces of the foot and give rise to localized infection, granulomatous foreign body reaction or both.
A cursory review of texts on surgery and dermatology fails to uncover mention of this condition.
The mechanism of the impaction is thought to be similar to the well known means of driving a needle through a coin, in which the needle is first driven through a cork bottle stopper of equal length. The cork is then placed on the coin and struck a sharp blow with a hard object. The splinting action of the cork prevents the needle from fracturing due to sideward bending. In a similar fashion the mesh of the sock or the pressure in the space between shoe and foot or a combination of both may so hold a hair that, once having gained entrance into a sweat gland duct,
SCHULZE HA. HAIR AS A PENETRATING FOREIGN BODY IN THE PLANTAR SURFACE OF THE FOOT. Arch Derm Syphilol. 1950;61(4):668. doi:https://doi.org/10.1001/archderm.1950.01530110134012
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