RENBP and keratosis: The epidermis of rats in the GBS-Ag group was completely repaired, and some keratosis was found, the dermis was rich in collagen fibers, elastic fibers and new blood vessels were abundant, inflammatory cells were rare, and new hair follicles and thick-walled blood vessels were also observed, which suggested that the GBS-Ag group had strong wound repair ability and promoted wound tissue healing and wound angiogenesis, and the low-dose Ag released by GBS-Ag sponge dressings had significant bactericidal effect and reduced wound inflammation.