Hi,
Partial loss of pigment may follow any inflammatory skin reaction, but this is most noticeable in those with dark skin.
There is very little that can be done although with timethe white area should eventually repigment.
Depigmentation often resolves spontaneously, but may persistent on occasion.
There are no medications which can trigger repigmentation in an area.It is best to wait it out till it resolves on its own.
I am pasting an article along with the site from which I got this information. Maybe you could give this a try.
"Our product Novitil® has been developed for a complete repigmentation treatment of your skin…It has been called "the most amazing product yet", giving you back not just the natural color of your skin but giving you the renewed confidence you are looking for…so you are free to conquer new horizons, to pursue your dreams…
Novitil® has no side-effects; it is safe and effective. It simply "tells" your skin how to remember and use its own coloring system to regain its normal appearance.
Novitil® is a unique product. It is effective and easy to apply! Typically, the first signs of repigmentation appear within a month of daily use and sunlight exposure. Most people obtain complete results, or substantial improvement, within six months of regular use."
ref: http://www.dermabest.com/
Do you know how long it takes for it to repigment? Ill look into this novitik product too