Shiseido Benefiance instant treatment Eye Mask ($72 for 12 pairs) is something I’ve been curious about for a while considering that it has great reviews online.  They’re expensive, at $6 per treatment, so I’ve resisted getting them. One day, my co-worker (the one who gave me all the freebies) pertained to work and handed me a pack of these and said, “Try these, they’re amazing”.  She’s a skincare junkie (as well as facial treatment junkie – she does peels, lasers, light therapy, the like) so I tried it that same night and I was hooked from the first use! Mi az? It’s a retinol treatment for the under...