Hi sir my name is varu, I have a problum

Effective ways to whitening skin or whitening special area of skin :
there is many way to whitening the specific area , but mainly you first have to consult a dermatology doctor before using any , and those ways are :
- using the products that contain hydroquinone ( need some months to see results )
- using products that contian vitamin A , retein-A , tazarotin ( need some months to see results )
- using laser treatment to remove black skin or change skin layer ( effective but need more than one session )
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 
Recommanded sun block products :
1. ROC Soleil-Protect High Tolerance
2. NEUTROGENA Ultra Sheer® Dry-Touch Sunscreen
3. Kiehl's Activated Sun Protector Water-Light Lotion