Thanks for posting your query.
I can understand your concern.
The abnormality of pigmentation can be constitutional or it may be a pimentation disorder called chloasma
You should avoid exposure to open sunlight which increases the differential pigmentation- carry umbrella and can use sun screens application.
you can use Skinlite
cream or optionally can apply Stronger Melalite cream and apply it only on the darker areas.
Do not worry about peeling, any cream will cause that but it would resolve.
I will be available for your follow up queries.