Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Multiple familial trichoepithelioma ?
    ### Response:
    What causes multiple familial trichoepithelioma? Multiple familial trichoepithelioma is thought to be inherited in an autosomal dominant fashion with reduced penetrance. Autosomal dominant means that a single mutation in one copy of a gene is sufficient to cause the condition.
    