Perforating granuloma annulare (PGA) is a rare subtype of GA. It is characterized by crops of erythematous umblicated or scaly papules. Plaques, pustule-like lesions and scars may also be seen. It can be localized or generalized.
Transepithelial elimination of mucinous, degenerating collagen fibers and surrounding palisading lymphohistiocytic granulomas, are important histologic features.
The patient reported here was a 23-year-old man with recurrent crops (every few weeks) of umbilicated papular lesions predominantly affecting trunk and extremities for 8 years, which resolved with varioliform scars.