Hello and welcome to HCM.
Though its difficult to diagnose without actual examination, from your history and description ,it seems you are having Melasma.
Melasma is a kind of
hyperpigmentation seen mostly in females of middle age and is dictated by hormones and sunlight.
It treatment is challenging but with proper regimen good results can be achieved.
Usually the treatment is divided into clinic based treatment and home based.
At clinic, I suggest series of
chemical peels like glycolic, Jessner, TCA with or without
microdermabrasion.
At home you can apply cream containing
kojic acid, arbutin, etc and vitamin C serum for maintenance.
Use high SPF sunscreen on regular basis.
Use
glycolic acid based facewash.
Hope this will take care of your issue.
Dr Hardik Pitroda