Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Herpes zoster oticus ?
    ### Response:
    Herpes zoster oticus is a common complication of shingles, an infection caused by the varicella-zoster virus (which is the virus that also causes chickenpox). Shingles occurs in people who have had chickenpox and the varicella-zoster virus becomes active again.
    