Lines on the legs can be caused by taking medications, growth lines, stretch marks or linear lichen planus. Swelling lines can appear in people who have been taking medications such as glucocorticoids for a long time. In the subcutaneous tissue grows too fast, such as rapid weight gain, can appear in the inner thighs or buttocks and other locations of the skin dermal elastic fibers fracture degeneration, the formation of red or silver-white lines. Similarly, pregnant women can develop stretch marks due to the above reasons. Linear lichen planus lesions occur on the flexure of the limbs, appearing as lines or bands of well-defined purplish-red flat papules with a waxy film on the surface and visible white reticular streaks, accompanied by itching. The appearance of growth lines on the legs generally do not require special treatment, if there are other symptoms of discomfort, we recommend timely consultation with a doctor, follow the doctor’s instructions for treatment.