Acquired reactive perforating collagenosis: a clinicopathologic study of 15 cases from Saudi Arabia.

Background  Perforating dermatoses include a family of disease characterized by transepidermal elimination of collagen. Despite being described many years ago in association with systemic disease, it is still clinically misdiagnosed. Objective  A retrospective clinical and pathologic review that will increase clinical and pathologic diagnostic awareness of this entity and explore associated systemic disease. Patients and methods  In this report, we present from Saudi Arabia for the first time details of a series of patients seen at the King Abdulaziz Medical City, WR, Jeddah, Saudi Arabia, during the period 2002–2009. Results  The study revealed 15 histologically confirmed cases of acquired reactive perforating collagenosis (ARPC). Patients were predominantly adult females with a mean age of 54 years. The lesions were pruritic, predominantly multiple, erythematous excoriated papules and umblicated nodules centrally crusted with an average duration of 6 months, involving the extremities with or without the trunk in 12 patients. Associated systemic disease included diabetes mellitus in 12 patients and chronic renal failure on dialysis in 8 patients. The provisional clinical differential diagnosis included perforating collagenosis in only eight patients. Conclusion  ARPC is not uncommon in Saudi Arabia. The noduloulcerative lesions involve predominantly the extremities, and diabetes mellitus is the most common associate. It is hoped that this article will increase awareness for recognition of this entity to start appropriate therapy.