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Keratosis punctata of the palmar creases.

We compared the prevalence of keratosis punctata of the palmar creases among populations living in Belgium, Togo, Peru and the United Arab Emirates. It appears that black Africans and Hindous (prevalence 1 to 2%) are more often affected than Latin Americans (prevalence less than 0.1%). The disease was not seen among Europeans and Arabs. Histologically, the lesions consist of a marked hyperkeratosis located at the site of acrosyringia. The disease should therefore be considered as a sweat gland disorder.