Serums are a great way to get added moisture, a specialized product to your Face and skin. 
ALPHA ARBUTIN SERUM- Alpha Arbutin may help in aiding dark spot's on your skin. They need to be used for about 6-8 weeks, before you may see some results. Add a few drops to your hands and rub on your dark spot's. It is always recommended to wear sunscreen when using Alpha Arbutin products.
FACIAL SERUM- This serum maybe great for the skin. It has Hyluronic Acid ( can help your skin hold water), Niacindamide, Hydrosol, and Glycerin (that draws water to the skin).