Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) dyskeratosis congenita ?
    ### Response:
    Dyskeratosis congenita is a disorder that can affect many parts of the body. There are three features that are characteristic of this disorder: fingernails and toenails that grow poorly or are abnormally shaped (nail dystrophy); changes in skin coloring (pigmentation), especially on the neck and chest, in a pattern often described as "lacy"; and white patches inside the mouth (oral leukoplakia).
    