How can i reduce dark spots on the face ?

Many options: There are many options including using topical creams such as bleaching creams (hydroquinone, kojic acid, elure), microdermabrasion, glycolic acid peels, salicylic acid peels, chemical peels, lasers (noninvasive lasers such as ktp laser work the best with least side-effects, ruby, alexandrite, nd:yag lasers), invasive lasers (co2, erbium, fractional co2, fraxel), ipl (intense pulsed light).

Dark areas on face: Most dark areas on the face come from a prior redness and inflammation. People with darker skin tend to have darker discolorations after an inflammation, like a pimples or a rash. So, the most important thing to do first is to treat the underlying rash, whether it is acne, dandruff, or an allergy with Hydrocortisone cream1%, and then use sunscreens to block the sun. Also try a bleaching cream.