Pregnancy
High levels of estrogen in pregnancy are supposedly responsible for highlighting your indented skin. Estrogen does this by causing increased water retention, leading to edema. It also causes sclerosis of the reticular fibers and fat storage in the body.
Menopause: Hormone imbalance is seen after menopause. The consequent effects on skin morphology and metabolism are to blame in this case.
Obesity: Although cellulite is not strictly coupled with obese subjects, increased weight gain evidently exacerbates the presentation of cellulite.