New York Post Composite Forget expensive facials — sometimes all your skin needs is 20 minutes with a really good sheet mask. I flew to Korea last year with one goal in mind: stock up on skincare. I came home with a suitcase full of cleansers, serums, moisturizers and more sheet masks than I could count. Since then, I’ve worked my way through what feels like an endless supply, and while I found plenty of good ones, only a handful have become repeat purchases. The Dr. Althea Aqua Blue Hydration Masks are at the top of that list, and right now you can grab four for just $10. My skin is on the dry side all year, but it gets especially dehydrated after traveling, spending too much time in air conditioning or skipping a few nights of my usual routine. Whenever my complexion starts looking dull