Hello and welcome to healthcaremagic. Skin color i genetically determined. Asian skin is type IV skin which contains fair amount of melanin and is prone to tan quickly as compared to caucasians/ people in the west who have very less melanin. Skin type cannot be changed but regular use of a broad spectrum sunscreen gel, which offers protection against both UVB and UVA, can be used to prevent sun induced tanning. A cream containing one or more of the following ingredients e.g kojic acid, glycolic acid, arbutn, magnesium acsorbyl phosphate etc can be use once daily at night to lighten up the tan and impart even tone to the complexion. Hope this helps you regards