I think skin relaxation is caused by losing weight too fast, such as losing10,20 kg in January, and it is well known that the faster you lose weight, the greater the possibility of rebounding. Even if it doesn't rebound, the skin will be surgically removed if it is slack, which is not worth the candle. I checked Riley's weight loss effect and found that he could lose 3-5 kg in almost a month. This reasonable speed will not cause skin relaxation.