During pregnancy, I was troubled by acne on my face line, and this was recommended to me at a department store, so I bought it as part of a coffret. The serum in this line was also pretty good, but with this Pure Pen, you just apply it directly to the acne you're concerned about. You can use it whenever you want, no matter the order. Before you know it, the acne has completely disappeared, and the acne scars are gone too. It's easy to use, but it's expensive to buy it individually. Also, it seems like the Shinjuku store has closed, so where can I buy it if I run out of the one I'm using now?