Zoster-associated extremity paresis is a rare complication of herpes zoster (HZ) and is usually due to zoster-associated mononeuropathy. Complaints of a 77-year-old man started with pain in his right arm and 4 days later he developed itchy red HZ lesions in the same area. One week later, the patient developed weakness in his right arm. The patient was diagnosed with isolated axillary mononeuropathy by physical examination and electromyography. Here, we present a case of axillary mononeuropathy which is a rare complication of HZ infection and needs particular attention.