One trick I swear by when I notice I’m having a bad skin day is to mix 3-4 drops of my favorite serum into my moisturizer. This works wonders if my skin is looking particularly dry– which is almost always when I travel! My skin has the tendency to look really dull and not as dewy as normal. When I notice this, I’ll drop some oil like this one by Farmacy into my moisturizer to give my skin an extra burst of nourishment and hydration it needs.