Acquired perforating dermatosis in patients on peritoneal dialysis: a report of 3 cases

BACKGROUND: Acquired perforating dermatosis (APD) is a heterogeneous group of unfrequented diseases (2.5 cases for 100,000 habitants) associated with multiple pathologies like end-stage renal disease and other concomitant conditions such as diabetes mellitus (DM). CASE DESCRIPTION: We described 3 cases of APD in patients on peritoneal dialysis (PD), one of them with a giant variant of reactive perforating collagenosis (RPC). The first case is a 28-year-old man with chronic kidney disease on PD and a lousy control of disturbances of calcium and phosphorus metabolism that develops an APD. The second case is a 44-year-old man with DM, chronic kidney disease (CKD) on PD, and poor control of disturbances of calcium and phosphorus metabolism that develops an RPC. The third case is a 58-year-old man with DM, rheumatoid arthritis, hypothyroidism, CKD and bad control of calcium and phosphorus metabolism that develops a giant variant of RPC with poor evolution. CONCLUSIONS: CKD and concomitant conditions such as DM present an increased risk of developing APD. Poor control of calcium and phosphorus metabolism is frequently found in patients with CKD and seems to be related to the development of APD in our cases. With the description of these cases, we want to emphasize the importance of knowing this rare disease, in order to promptly refer to Dermatology and start treatment.