Syringoma-like sweat duct proliferation in scalp alopecias

We have reviewed a series of 585 scalp biopsies taken for histologic evaluation of hair loss and have looked for syringoma-like eccrine sweat duct proliferation. This feature was found in 6 specimens with scarring alopecia and one each with alopecia areata and female-pattern alopecia. Syringoma-like sweat duct proliferation appears to play no role in the etiology of hair loss.