Herpes zoster, known in Chinese medicine as “waist wound fire dan” and commonly known as “spider sores”, is caused by varicella-zoster virus infection, which occurs in late winter and spring and autumn, and is common in adults. The main manifestation is clustered blisters, distributed along the nerves, arranged in bands, usually unilaterally, and accompanied by significant neuralgia. The chronic pain syndrome, called postherpetic neuralgia (P HN), is characterized by jumping pain, burning pain, intermittent stabbing pain, and abnormal sensation, and the older the patient is, the more difficult it is to eliminate the pain, greatly affecting the patient’s life and work. The mechanism of P HN is related to peripheral nerve trunk edema, inflammation, increased activity of peripheral sensory afferent fibers (including injury receptors), ectopic impulses, causing central synaptic regeneration, and central sensitization, so it is especially important to reduce local injury, promote early healing, control neuralgia, and weaken peripheral injury receptor sensitivity and resulting central sensitization during the acute phase of herpes (AHZ). The current clinical treatment of postherpetic neuralgia mainly includes the following methods. Oral pain medications: tricyclic antidepressants (e.g., amitriptyline), antiepileptics (e.g., carbamazepine, gabapentin), opioids (e.g., morphine); local anesthetic treatment (e.g., lidocaine ointment); nerve blocks and hyperbaric oxygen therapy, etc. In physical therapy, the combination of long-wave ultraviolet (UVA) and infrared (IR) wavelengths is effective in the treatment of postherpetic neuralgia. The absorption of UVA by the skin produces a series of photobiological effects, which can make tissues eliminate pain-causing substances, increase the pain threshold and reduce the excitability of skin sensory nerves, thus playing a pain-relieving role. At the same time, the erythema effect produced by UV irradiation can inhibit the excitation foci of the original pain, thus eliminating pain; infrared irradiation produces thermal effects to dilate blood vessels, accelerate blood circulation, rapid absorption and dissipation of inflammatory substances and surrogate products, improve cell phagocytosis and cell function, and facilitate tissue regeneration and repair. The thermal effect of infrared radiation can also reduce the excitability of nerve endings, play a sedative and analgesic role and promote the recovery of nerve function. Therefore, combined UVA+IR has a synergistic therapeutic effect and can prevent and relieve postherpetic neuralgia more quickly. As can be seen, there are many treatment options for postherpetic neuralgia, but they lack specificity. Patients can be selected according to their specific situation, using single or combined treatment to reduce pain and shorten the course of the disease.