Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Ocular cicatricial pemphigoid ?
    ### Response:
    Ocular cicatricial pemphigoid (OCP) is a form of mucous membrane pemphigoid (a group of rare, chronic autoimmune disorders) that affects the eyes. In the early stages, people with OCP generally experience chronic or relapsing conjunctivitis that is often characterized by tearing, irritation, burning, and/or mucus drainage.
    