If you are referring to the lower legs due to stick like calf's then Calf Augmentation is a good procedure to give the lower legs more volume. Sculptra is also a good way to add volume, it stimulates your own collagen and could be another treatment to consider You should have a consultation with a board certified plastic surgeon who has experience with this type of surgery. After you have learned what your options are you will make a decision on how to make your legs bigger.