Also called liver spots or lentigines, they might look like extra-large freckles. These discolored areas, which can be as big as a quarter, tend to get darker and show up more often with age. A spot that was tan when you first noticed it in your 30s can turn brown and then dark brown in your 40s and 50s. Keep an eye on these spots, and tell your doctor if you notice changes in texture, a raised surface, more than one color within the spot, sudden darkening, or an oddly shaped border.