Sir I am having badly hyper pigmentation since two...

Effective ways to whitening skin or whitening special area of skin :
1. using the products that contain hydroquinone ( need some months to see results )
2. using products that contian vitamin A , retein-A , tazarotin ( need some months to see results )
3. using laser treatment to remove black skin or change skin layer ( effective but need more than one session )
4. using nitrogine treatment to remove black skin ( effective but may need more than one session )
5. use whitening injection to whiten the area directly ( immediet effect but not recommanded ) 
Recommanded product to whiten skin :
1. Olay White Radiance Brightening Intensive Cream
2. loreal whiten products 
3. Kaya Pigmentation Reducing Complex
General advices :
1. consider consult a dermatologist first before start looking for medical treatment and follow doctor instrcutions 
2. use sun block products regularly
3. pay attention to personal hygine 
4. always keep you skin moist