Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Darier disease ?
    ### Response:
    Darier disease is a skin condition characterized by wart-like blemishes on the body. The blemishes are usually yellowish in color, hard to the touch, mildly greasy, and can emit a strong odor. The most common sites for blemishes are the scalp, forehead, upper arms, chest, back, knees, elbows, and behind the ear.
    