There are two main reasons why the growth line is thin but the ass is long:
First of all, it may be caused by the rapid physical development in adolescence. For developing people, due to the rapid growth of the body, the skin will produce texture in a short time due to excessive stretching, and the natural skin position will also produce texture. And because there is more fat in this place, the growth line will be more obvious.
Secondly, because of the rapid weight loss, many people don't have much human flesh, but in order to get a better figure, they will choose to continue to lose weight in the devil's way. After losing weight quickly in a short time, the skin above the skin failed to recover in time, and finally left an obvious growth line.
That's why you are thin but have a long ass and many growth lines. If you feel that you are troubled by the lines that appear, you can choose skin care or medical beauty to dilute the repair, especially for girls. The sooner the effect, the better.