Definition: persistent, well-demarcated, reddish-brown nodules of unknown cause that usually appear on the face in middle age and consist of a dense dermal infiltrate of eosinophils and neutrophils, separated from the epidermis and hair follicles, with fibrinoid vasculitis of unknown cause.
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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.