For diabetic foot ulcers with "pockets" (wound edge undermining), a surgical incision to the undermining space and debridement are required primarily. Osteomyelitis should be treated if present. Furthermore, it is necessary for the foot to be able to withstand load after controlling the infection and necrosis. We report a case of a patient treated with a skin-covering pocket as a local flap and negative pressure wound therapy with instillation and dwell time and negative pressure wound therapy to relieve osteomyelitis and promote wound contraction. There was no involvement of other body parts, and only the pocket consisting of skin at the sole of the foot was used, and load could be withstood.