Hylexin cream stops dark undereye circles caused by tiny blood vessels breaking.  You can read all about Hylexin here. However, for it to keep working, you need to keep using it. It is well worth it if it works for you – here’s a way to get a discount on it, since department stores rarely if ever offer any kind of discount on Hylexin:

It is available at Sephora.com for $95. If there is a Sephora promo going on, it may be worth trying through Sephora to see if it works for you.