Lose skin after weight lost .. i have lost from 87 kg to 52 kg in a year .. i have lose skin in my breasts, abdomen and thighs am 25 years old ?

Massive weight loss : Rapid & significant weight loss is beneficial however often skin doesn't shrink optimally. Even young skin, which has been stretched out by excess weight will have difficulties conforming to a slimmer frame. Do try to loose weight slowly and keep it off. Skin sagging is exacerbated by recurrent cycles of weight gain and loss.

Loose skin: Congratulations on your weight loss! loose skin will not go away with exercise or more weight loss. Instead, it needs to be removed surgically. See a surgeon who is certified by the american board of plastic surgery.