If you suffer from dark circles or wrinkles, you will LOVE a Highlighting Pen. It is not a concealer and does not replace concealer. It also should never be used for acne or any other raised area. Highlighting Pens are only used for recessed areas like dark circles or creases caused by wrinkles. How do they work? They have light reflecting pigments that reflect light and bring out the recessed areas. It is the perfect touch up for a long day. It is my American Express card; I won't leave home with out it!