The first thing to consider when white lines appear on a patient’s legs is that they may be caused by dry skin. In the autumn and winter season, due to the decline in air humidity, coupled with the failure to do a good job of hydration in a timely manner, it can cause the performance of dry or cracked skin, which in turn leads to the patient’s legs with skin cracking, white lines, skin flakes and other symptoms. In addition, there may also be the following conditions caused by white lines on the legs: 1, expansion lines: If the patient is in puberty, pregnancy state or the state of abnormal weight gain, the appearance of white wavy stripes on the legs, and no conscious symptoms, then it can be judged as expansion lines. It is mainly caused by the overstretching of skin elastic fibers, fragile and fracture, which generally has no effect on the health of the body and need not worry too much; 2, atrophic lichen planus: it is common in the lower limbs, viral infection, endocrine disorders, metabolic abnormalities and other factors can trigger atrophic lichen planus, the patient’s lesions have flat, itchy papules, and after the papules atrophy, there are light white spots, and the spots can be connected to each other If the patient has white lines on the legs and scales when scratching, it is necessary to consider superficial skin lichen planus, which may be caused by Malassezia infection.