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February 26, 1968

Plantar Pseudochromidrosis

JAMA. 1968;203(9):807-808. doi:10.1001/jama.1968.03140090191021

To the Editor:—  Plantar pseudochromidrosis is a benign, self-limited condition which is probably caused by trauma. It is probably very common but is not mentioned in standard textbooks. It is most likely to be confused with plantar wart or malignant melanoma. Trimming the surface of the lesion will usually make the correct diagnosis possible. Although it is probably fairly common, it is not well known, and is represented in the United States literature by a single report.

Report of a Case:—  A 19-year-old youth, who was being treated for acne, asked about some black spots on his foot. These consisted of a cluster of dark-red to black dots covering an area about 1.5-cm square on the posterolateral surface of one heel (Figure). The keratin in the area involved was no thicker than that of the uninvolved foot, and the lesion was not tender. When the lesion was trimmed the dark