Soft tissue infection is a relatively common infection, relatively superficial in the infection, the identification is first of all with deep tissue infection, more common acute hematogenous osteomyelitis to distinguish. Soft tissue inflammation generally has mild systemic symptoms or even no fever, but the local manifestations are more severe, more obvious, with redness, swelling, heat and pain, and superficial pressure pain. In hematogenous osteomyelitis, the infection is caused by the bone, which is deeper, and the pressure pain points are in the epiphysis of the long tubular bone, which is the long bone, such as the ends of the thigh bone and calf bone, and the pressure pain is confined to this area. Soft tissue infection is on one side of the limb, on the bone side, and the pressure pain is previously limited to one or two planes, so the location of the pressure pain is more important for differential diagnosis. The second thing that needs to be differentiated is tumor ulcers, which are caused by tumor ulceration and sometimes look redder and more like infections, mostly caused by malignant tumors in superficial parts of the body or skin, such as skin cancer or breast cancer, which will break down and form ulcers after breaking down. The ulcer is characterized by hard edges, protruding outward and cauliflower-like in overall appearance, and the discharge is bloody, unlike the purulent discharge of infection, which has a foul odor. For example, breast cancer can cause lymph node metastasis in the armpit. The final diagnosis depends on the pathological examination of the lesion, which is the basis for confirmation.