There are many reasons why your skin would turn dark. Sun tan, overweight, pigmentation
disorders like acanthosis or melasma
, nutritional deficiency etc are some conditions. Unless someone examines you, we cannot know the cause. Unless we find out the cause it is difficult and pointless to treat. Please call me or send photos with detailed history using online consult option for proper treatment. The more you rub with soap, the darker it will get.