One of the best ways to camouflage under eye darkness besides a great concealer is knowing when to apply it while doing your makeup.
If you have been in the habit of starting with concealer first and then finishing with foundation, you dilute the masking capabilities of the product by blending. This order of application will only hamper your efforts.
Therefore, never start working on your eyes with concealer until your foundation is on first. This will definitely improve your under eye lightening results.