Necrotizing fasciitis is an acute progressive infection that develops severe systemic toxicity. If this is not treated in a timely manner, it leads to a fatal outcome. The treatment with fluids, antibiotics, and debridement is the basis for management; however, negative pressure systems are positioned at a strategic point for treatment, especially in large areas, such as lower limbs. This is the case of a 17-year-old male with no relevant medical history, who developed extensive necrotizing fasciitis in the inguinogenital region after fasciotomies due to compartment syndrome, in whom a handmade negative pressure system was successfully applied.