Kiehl's Since 1851 Clearly Corrective Dark Spot Solution
The Kiehl's Since 1851 Clearly Corrective Dark Spot Solution ($54-$138) uses activated vitamin C to tackle older, deep-set dark spots while white birch extract helps with evening overall tone. This is the product I pick when I have more stubborn hyperpigmentation. I use it twice a day for at least a month as a spot treatment to notice real results. (The key here is patience and consistency as it will lighten my acne scars that haven't yet faded with other products and doesn't leave dry patches . . . but takes time to do so.)