skin color change from rubbing?

Hi
Welcome to ehealthforum,
You can consult a dermatologist for this purpose. The nature and type of treatment would depend and can vary based on the type of pigmentation that you have. If the pigmentation is due to friction, it would come back. You can try out with natural bleaching agents like juice of lemon, potato juice or tomato and cucumber juice with application 2-4 times a day daily on affected areas allowing it to dry and washing it off with lukewarm water. Avoid use of deodorants, perfumes, harsh soaps and chemicals. Drink plenty of water. Have healthy diet with plenty of fresh fruits and fruit juices. Focus on weight loss to be in ideal weight range for your height.
Take care.

madam, thanx for replying me.....i would follow the remedy what u gave ...i have a heavy hair loss due to stress and workloads...can u give me any natural remedy for hair gain.......