In the makeup world there is nothing more gratifying than, when a product that you suggest, lives up to the hype. If you recommend a holy grail product, in actuality it must be that. I recently tried the highly raved about, It Cosmetics Bye Bye Under Eye Concealer and have been wearing it for almost 4 weeks now. If you’d like to know how this concealer performed on someone with dark sunken under eyes. Then keep reading to find out!