Dark Aereola...need help

Hi,
my sisster has a very dark aereola,it has almost covered half of her breast during her pregnancy,doctor said it will reduce after delivery,but now its more than 8 months of her post pregnancy and she has the same problem...our grandma asked her to use paan leaf n rub the dark area,but in vain.
Is there any other home remedy or cream,which could help her?
thank you

Friend.
From the very beginning of the pregnancy journey, breasts are at work. They are evolving and preparing for the arrival of the baby.Your hormones are the cause of these changes and you may experience some effects more than others,and may even have the continual effects.Women can expect the areola to return to its pre-pregnancy colour after they quit breastfeeding, but some do not. However, the color may lighten but it isn't likely to become as light as it was before becoming pregnant.
Nothing to worry.Please keep in mind that all these are NATURAL and COMMON.
Ask your sister to enjoy her motherhood rather than bothering about.
Please read my post here:
Skin Problems During PREGNANCY-Remedy please.

thank u yashikushi for replying, i will make her understand that it is quite common and normal... but i would like to know wthr these pigments are permanent? there must be some solution to get rid of it?