It is seen on the soles of the feet. It predominates in weight-bearing areas, and it can be unilateral or bilateral (97%). It is rarely seen on the palms. The dermatosis is composed either of punctiform depressions or superficial erosions of 1-3 mm that form rows that coalesce into circular lesions or irregulars lesions of geographic appearance. Their color is gray, greenish, or brownish, and they appear filthy (Fig. 7.1). Rarely there are erythematoses, and painful lesions or tinea pedis. There is a rare hyperkeratotic form (keratoma plantare sulcatum). Its existence is moot. It appears as circinated zones of hyperkeratosis on the plantar arc of the feet, and it can be observed as small depressions. It can be associated with other forms of palmoplantar keratoderma.
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