Linear moss is common in children, the cause of the disease is unclear, the disease is self-limiting. The cause of linear moss is not clear, and may be related to spinal cord nerve dysfunction, trauma and pressure, etc.; it is more common in children, and there are more females than males, and siblings may suffer from the disease at the same time. Linear moss is mostly unilateral, most of them have no self-conscious symptoms, occasional itching, and the lesions may be pinhead or grain-sized; a few decks are affected with deck stripes; some of them may have a prognosis of hypoplasia, and some of them may recur. Need to pay attention to distinguish with other diseases, do not be too alarmed when suffering from linear moss, the disease has a self-healing, if the symptoms should go to the hospital in time to diagnosis and treatment.