If I lose weight fast, will I have a lot of extra skin hanging over?

Lax skin with loss. It depends on your age and degree of weight loss. Although previous striae may become worse looking with weight loss, they will not be caused by the weight loss. For the most part they were caused by the weight gain that preceded the weight loss. However, it is common for patients to seek surgical correction or other treatments after successful weight loss to eliminate the loose skin.