Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Langerhans Cell Histiocytosis ?
    ### Response:
    Key Points
                    - Langerhans cell histiocytosis is a type of cancer that can damage tissue or cause lesions to form in one or more places in the body.    - Family history or having a parent who was exposed to certain chemicals may increase the risk of LCH.
    