As a natural diuretic, alcohol dehydrates your entire body, and its after effects can be seen in breakouts, redness, inflammation and
overall skin dryness.
This helps the surface of your
skin to look more hydrated for a little while, but as it evaporates (which it regularly does unless you're in a very humid climate), you're left with less hydration
overall, leading to
dryness, dullness, and accelerated aging.