The healing of Infective wound is a complex and lengthy process, which involves bleeding, infection, edema, granulation tissue formation and tissue plasticity.

Red light has strong penetration and high power, which can improve the activity of DNA-RNA-protein system and promote the synthesis and activation of proteins. In addition, red light can cause a series of photochemical reactions in local tissues, resulting in the destruction of cell membrane structure and function. After absorbing red light, mitochondria release a large amount of catalase, which can remove oxygen free radicals and promote cell metabolism. Meanwhile, it can significantly increase the secretion of vascular endothelial growth factor (VEGF), platelet-derived growth factor (PDGF) and transforming growth factor (TGF-β), accelerate the proliferation of wound vascular endothelial cells, promote neovascularization, improve microcirculation and nutrient supply, and accelerate the growth of granulation tissue and wound healing.

When red light is used for treatment, debridement should be as complete as possible and the wound surface should be fully exposed. The dry wound was covered with 0.9% saline gauze, which was more conducive to the crawling of epidermal cells.

Although surgery can solve the problem of local necrosis and infection, it also takes longer to heal. Red light therapy is based on surgical intervention to promote inflammatory absorption, accelerate wound healing, reduce patient pain and medical costs.