Topical zinc oxide for open pilonidal sinus wounds: a randomised, double-blind, placebo-controlled multicentre trial

INTERVENTION: Zinc oxide and polyvinylpyrrolidone versus polyvinylpyrrolidone alone CONDITION: Pilonidal excisional wound ; Surgery ; Excision PRIMARY OUTCOME: Time to wound closure in days, defined by complete coverage of the; wound with visible epithelium. SECONDARY OUTCOME: Secondary outcomes were:; 1. Postoperative antibiotic treatment; 2. Re‐operations; 3. Pain intensity; 4. Adverse events; ; Tertiary outcomes were:; 1. Serum‐zinc levels; 2. Sick leave INCLUSION CRITERIA: Patients, 18 years or older, with a first‐episode of pilonidal abscess requiring surgery are included after giving their written informed consent.