“…An infection in a surgical wound within 30 days postoperatively is referred to as a surgical site infection (SSI). This type of infection is the leading cause of prolongation of hospital stay, higher medical expenses, and delayed chemoradiotherapy after head and neck surgery (McDevitt, Cancela Mde, Kelly, Comber, & Sharp, ; Penel et al, ). Surgery for oral cancer is defined as a clean‐contaminated surgery by the Centers for Disease Control and Prevention (CDC; Mangram, Horan, Pearson, Silver, & Jarvis, ), and reconstruction with a well‐vascularized free flap is standard treatment for a large defect after extended resection of oral cancer (Makiguchi, Yokoo, & Kurihara, ; Markiewicz et al, ; Zhang et al, ).…”