Best For Dark Spots: Rosen Skincare Bright Citrus Serum Containing 20 percent vitamin C and mulberry extract, the Rosen Skincare Bright Citrus Serum ($25) is made for handling those stubborn dark spots and hyperpigmentation. It's a lightweight serum that is powerful. It not only diminishes dark spots but also fights acne-causing bacteria. Image Source: target.com Rosen Skincare Bright Citrus Serum $25 from target.com Buy Now