HighlightsIncisional hernia is not an uncommon complication after abdominal operation.Mesh migration and erosion causing vesico-cutaneous fistula and subsequent necrotizing fasciitis is uncommon.We hereby report a case of abdominal wall necrotizing fasciitis 21 months after laparoscopic incisional hernia repair in lower midline with dual mesh, due to mesh migration and erosion into urinary bladder, resulting in fistulation between bladder and abdominal wall.Mesh erosion to viscera can cause severe complication. Its risk should be balanced and discussed with patient with full consent.