Flabby hips can be caused by a number of factors. Excess estrogen that destroys collagen fibers and elastin, and excess aromatase that destroys the fibroblasts that make collagen under the skin. However, uneven hips can also be caused by scoliosis or a difference in leg length. Cellulite is another common condition that causes lumpy, dimpled flesh on the thighs, hips, buttocks and abdomen. A flabby hip can also be caused by excess fat around the hip area. This can be due to a lack of physical activity and an unhealthy diet.