There is no good procedure to specifically help extra skin just above your knees. You may be a candidate for a thighplasty, which would help tighten the skin of the inside of your thighs. This produces a very significant scar. The skin above your knees probably would not be helped.
Based on the degree of skin laxity shown in the photo a thigh lift would be recommended for you. This procedure involves an incision that will run the length of the inner thigh to about the knee level and a portion of the crease of the inner thigh. The purpose is to remove excess skin and contour the thigh. See a board certified plastic surgeon near you to learn more.