You're probably thinking this is a silly question but trust me how you dry your face can make a difference to your complexion. Here's what you need to know:
Never ever use the same towel for more than a day or two. Each use will leave the towel dirtier than the last time because you are picking up dead skin and residue from the cleanse. Also, hanging the towel can breed bacteria (this may be the reason you're getting acne).
Never rub but pat dry. Rubbing can irritate your delicate skin and can contribute to wrinkle development.
If you have the time this is the best method to avoid any unwanted bacteria on your skin.
How to air dry?
After rinsing skin, pat off the excess water using your hands. Then let it dry naturally. I usually spray on toner when my face is still moist to really let the ingredients sink in.
This probably sounds funny but if you're in a rush this is the second best method to get through your skin care routine in a matter of minutes. Make sure you're using "cool air" to dry your face, otherwise you'll just end up dry skin.
Tip: you can also use this method to dry your moisturizer faster!