Tattooing is performed in day hospital.
A short general anesthesia of 10 to 15 minutes is needed to perform the injections around the anal margin.
A mixture of methylene blue and lidocaine is injected into the dermis of the anal margin. The injection of methylene blue will destroy the nerve endings in the skin responsable for the itching.
The skin around the anus will temporarily color blue for 2 to 4 weeks.