The lines behind the calf may be caused by growth lines, obesity lines, varicose veins, etc., which can be removed by drugs, laser, surgery and other treatments. 1. Growth lines: growth lines, also known as expansion lines, are mainly due to the increase in the volume of bones, muscles, fat, etc. over the speed of skin extension, resulting in the dermal elastic fibers are pulled off and the formation of lines, which can be manifested in the back of the calf with lines. Medications such as Mucopolysaccharides Polysulfate Cream and Vitamin E can be used under the direction of a doctor to lighten and alleviate growth lines. It can also be treated by carbon dioxide fractional laser to restore skin elasticity. 2. Obesity lines: the body is mainly obese, making excessive accumulation of fat in the calf area, which can easily lead to rupture of skin elastic fibers and cause long lines. Attention should be paid to weight control, treatment principles with growth lines. 3. Varicose veins: due to sedentary and standing for a long time, the blood circulation of the lower limbs is poor, which affects the venous return and leads to varicose veins, which may appear behind the calves with the symptom of wrinkles. Avoid standing for a long time, wear compression stockings, etc. Drugs such as Diosmin tablets and Mai Zhi Ling tablets can be used under doctor’s guidance to promote venous return in the lower limbs. Varicose veins can also be treated by high saphenous vein ligation plus varicose vein stripping surgery. If you have lines on the back of your calves, you need to go to the hospital for a relevant examination to clarify the specific cause and then actively cooperate with the doctor for treatment.