Erosive pustular dermatosis of the scalp: a neutrophilic folliculitis within the spectrum of neutrophilic dermatoses. A clinicopathologic study of thirty cases

Histopathology of primary lesion of erosive pustular dermatosis of the scalp has not been characterized. Biopsy of intact follicular pustules shows spongiotic vesiculo-pustules affecting the follicular infundibula. Erosive pustular dermatosis of the scalp is a neutrophilic superficial folliculitis, with some clinicopathologic similarities with other pathergic neutrophilic dermatoses, such as pyoderma gangrenosum.