The appearance of reticular lines on the lower legs may be a normal physiological phenomenon, or it may be caused by varicose veins of the lower limbs, reticular bruises and other factors. 1. Normal physiological phenomenon: Reticulated veins may be superficial veins in the skin of lower limbs, such as branches of great saphenous vein and small saphenous vein. If these veins do not protrude from the surface of the skin, and there is no pain, numbness and other uncomfortable symptoms, they are generally normal veins and do not need treatment. 2. Varicose veins of the lower limbs: people who sit or stand for a long time are prone to varicose veins of the lower limbs, which are characterized by bulging, expanding and tortuous damaged veins, especially the saphenous vein of the lower leg, and may be accompanied by symptoms such as skin atrophy and desquamation, and may also lead to complications such as phlebitis of the lower limbs and rupture and bleeding of the varicose veins. 3. Reticulocyanosis: it can be congenital, or secondary to cause intravascular obstruction or vascular wall or immune system diseases, mostly seen in the lower limbs, when encountered with cold, the skin appears greenish-purple or reddish reticulation spots, the skin between the spots is normal or pale, the symptom can be disappeared after warmth preservation, the patient usually has no conscious symptoms, a few patients may appear numbness, hidden pain, tingling and other sensations. Calf net-like lines may also be caused by other factors, it is recommended that patients seek medical attention in a timely manner, in order to clarify the cause of the symptomatic treatment.