A peculiar condition of the soles and heels, first described by Castellani1 who named it keratoma plantare sulcatum, is met with in tropical and subtropical climates.2
Briefly, the following symptoms may be noticed: There is a marked thickening of the horny layer of the soles, which is most pronounced on the parts in contact with the earth during walking. Here the horny layer contains numerous holes of different sizes and depths, while in the well developed stage of the condition, many fissures, often of an arcuate shape and never extending deeper than to the inner side of the stratum corneum, are also present. Because of the dirt that accumulates in the holes and fissures, they stand out sharply against the yellowish-brown background.
The condition is seen in its most typical form during the rainy seasons. The pitting and fissuring disappear in the dry seasons, and
AARS CG. KERATOMA PLANTARE SULCATUM (CASTELLANI). Arch Derm Syphilol. 1931;24(2):271–279. doi:https://doi.org/10.1001/archderm.1931.01450010278010
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