Abstract
Generalized perforating granuloma annulare is characterized by 1 to 4 mm umbilicated papules on the extremities, and is most commonly seen in children and young adults. Trans-epithelial elimination of mucinous, degenerating collagen fibers and surrounding palisading lymphohistiocytic granulomas are important histologic features. Perforating sarcoidosis and perforating granuloma annulare may be difficult to differentiate because of a similar clinical appearance and the presence of sarcoidal granulomas in biopsy specimens. A particularly high incidence of perforating granuloma annulare has been reported in the Hawaiian Islands.
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