For pain caused by the absence of a lump under the armpit, it may be paronychia, but also peripheral neuritis, vasculitis, muscle as well as fascial damage. In this case, the first step is to clarify the cause and give symptomatic treatment. If the pain is obvious, you can consider taking oral Chinese medicine such as Prozac and Lactaid capsules. Keep a relaxed mood in daily life, avoid stress and anxiety, avoid eating high calorie and food containing exogenous hormones. Peripheral neuritis, avoid exposure to harmful heavy metals. Actively treat primary diseases, such as diabetes, kidney disease, etc. For patients with clinical symptoms, in addition to active treatment of the primary disease, symptomatic management can be considered. Nerve-nourishing drugs such as vitamin B1, B12, nerve growth factor, coenzyme Q10, etc. are used, as well as drugs to improve microcirculation, such as Chuanxiongzine hydrochloride and low molecular dextrose. For myofascial injuries, cold compresses should be given at the early stage, and hot compresses can be considered at 48 hours. Local physiotherapy, massage, massage, local painful spot closure treatment, etc. are also available. For patients with phlebitis, sensitive antibacterial drugs should also be used for intravenous infusion.