The darkening or discolouration of the genital, anal, underarm, areola & other areas of the body can be due to hormonal changes or just ageing. Of course people with dark skin also have more pigment in intimate areas which they'd like to whiten.
In the past bleaching agents have been used to lighten the skin, but now there are safer, chemical free ways to achieve effective skin lightening, using natural formulas; kinder to your body but bring results.