Does it make a difference when you put on a facial mask? (morning/night) Which is better?

It doesn't really make a huge difference, but if you want to nitpick it would depend on the type of mask. I've read somewhere that if it's one meant to actively treat an issue (i.e. deposit some sort of product into the skin, like a moisturizer or anti-aging component) it would be better to use it at night, as your skin repairs itself and is more receptive to the product. If it's one meant to purge the skin of oil or impurities (usually these are the more mud-like masks, but not always) then it's less important. I wouldn't really worry about it though, as long as you're taking care of your skin appropriately the time of day you use your mask seems pretty unimportant. You really have to experiment with the different skincare regimes available in order to find what works for you, just stick with each one for at least three weeks before you give up. Your skin needs time to adjust and sometimes things get worse before they get better as dirt and impurities deep in your pores can cause breakouts as a new effective skincare regime brings them to the surface. Just be sure to wash, tone, and moisturize twice a day (ALWAYS before bed, especially if you're wearing make-up), exfoliate regularly, and wear sunscreen everyday. Drinking lots of water and having a healthy diet (they make some pretty good supplements solely for skin now) makes a big difference, as well. I've heard mixed reviews about Clinique's new dark spot corrector for acne scars, but I know a couple girls who swear by it, so it might work for you.