Thigh lift is known as Thighplasty, it is a surgical plastic procedure to reduce or remove the excess skin or fat around the thigh area in order to reclaim your firmer look. Fold of skin around the thigh could be happened from varies reason such as;

DNA from parents
Excessive or sudden weight loss
Ageing

Thigh lift procedure usually applied on inner thigh area where the excess fold of skin appear and it does not really lift the back or front portion of your leg, therefore, liposuction may be applied alongside with thigh lift in order to create aesthetic looks all around your leg, thigh and glute area.