We all encounter stress in different parts of our lives. But in a nutshell, stress affects skin in five ways: accelerated aging, adult acne, irritation, dullness and dehydration. When skin is stressed it does not act properly, it's out of balance, it's literally exhausted, irritable, drained and depleted.
In my 20s (usually after a night of partying) I would occasionally fall asleep with a full face of makeup. However, as the years have progressed, my need for a squeaky clean face has become important to me. Between the sweat, sun and activities of the hot summer months, I feel even more compelled to take care of my mature skin.