Atrophic lines, also known as “swelling lines”, “stretch marks”, “linear atrophy”, “white lines”, manifest as Atrophic striae of the skin, initially pale red or purple-red, and later turning to pale white. Although it does not affect health, it is annoying because of its aesthetic impact. In adolescence, 1/3 of people can have these lines, called “growth lines”; in 75% of pregnant women can have atrophy lines, called “stretch marks”. What do atrophy lines look like? Atrophic lines are corrugated stripes, initially light red, slightly elevated, after a long time they turn to light white, slightly concave, with a smooth and slightly wrinkled surface, sometimes vascular texture in the skin is faintly visible, no pain or itch, can become lighter over time, but generally do not fade completely. Why do atrophic lines appear? The elastic fibers of the skin become fragile and are then subjected to overstretching, causing them to break. What are the common triggers? Common triggers: pregnancy, sudden weight gain, rapid growth, long-term use of glucocorticoids or topical application, etc. What are the most common sites of atrophic lines? It is more common in females than males, and is more common on the elbows, above the knees, inner femur, buttocks, shoulders, and lumbosacral area. They are more common in women than in men and appear on the elbows, above the knees, inner femur, buttocks, shoulders, and lumbosacral area.