A singular dermatosis of Mongols.

A long-term, erythematous, follicular papular dermatosis affecting the presternal and interscapular skin was found to occur in subjects with Down's syndrome. One hundred seventy-four subjects (110 male and 64 female) were surveyed. The condition was seen in 46% of the males, with the highest incidence in patients who were between 20 and 40 years of age; the condition was rare in the females. Our findings suggest that this condition is much commoner than any other abnormal skin feature described in the literature on Down's syndrome.