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Highlights This food biopolymer-based biogel unites the challenging needs of elastic yet injectable wound dressing and skin bioelectronics in a single platform. This is the first demonstration of a hydrogel dressing that satisfies both deep and superficial wounds, and for the accelerated healing of diabetic wounds. Biogel-based flexible skin bioelectronic can serve as a “fever indicator” and monitoring human activities and tiny electrophysiological signals, providing important clinical information for the rehabilitation training of the wounded.