To observe the effect of ultrasound-guided platelet-rich plasma (PRP) injection in the treatment of herpes zoster neuralgia (HZN). Eighty patients with HZN were randomly divided into observation group and control group, with 40 cases in each group. The observation group was treated with ultrasound-guided PRP injection of target nerves combined with drugs. The control group was treated with drugs alone. The pain scores of before treatment (T0), and 1 week (T1), 1 month (T2), 3...