[Bullous rash around a peritoneal dialysis catheter exit site].

BACKGROUND: Cutaneous eruption around a peritoneal dialysis (PD) catheter exit site is a rare complication. Herein we report a case of bullous eruption; we discuss the diagnostic approach and the related therapeutic implications. PATIENTS AND METHODS: A 63-year-old man presented a bullous periumbilical eruption two months after initiation of PD. Cultures of laboratory samples ruled out an infectious origin and systemic corticosteroids initiated at 0.5mg/kg for suspected eosinophilic peritonitis produced significant improvement of the cutaneous eruption. Recurrence of the bullous eruption was observed upon dose-reduction of the corticosteroid. Skin histology showed a clinical picture of eczema and direct immunofluorescence was negative. Patch testing was carried out using the European Standard Battery comprising antiseptic, cosmetic and plastic series; a semi-open test was performed with the dressing used for PD, and ROAT was carried out on the povidone iodine (Betadine™) 10% used for topical care during PD. The patch testing and ROAT were positive (++), confirming contact dermatitis due to Betadine™. The eruption totally disappeared on substitution of Betadine™ by chlorhexidine for topical antisepsis of the PD catheter, thus enabling PD to be continued rather than instituting hemodialysis. DISCUSSION: Allergic contact dermatitis around a PD catheter is a rare and little-known complication. In the present case, ROAT testing showed sensitization to Betadine™ and enabled an alternative antisepsis solution to be found, allowing PD to be continued.