Colder weather calls for bold lip colors, and nothing is better than completing your look with a crisp swipe of your favorite lipstick. The downside of vibrant lip shades is that you’re more likely to notice when they start to pill. To make sure your lipstick stays smooth and flake-free, we tapped the expertise of professional makeup artists Brittany Lo and Terri Bryant. Below they explain why your lipstick may be pilling and how to prevent it from happening. What Causes Lipstick to Pill?There are a few reasons why your lipstick may be pilling. The most common are applying lipstick to dry lips and putting on too much product. Though this is less likely, using expired lipsticks could also be the culprit. “A change in color, texture or smell are all tell-tale signs your lipstick has expired,” says Bryant. “Whether due to a change in texture or poor formulation, dry lipstick is lacking a balanced level of emollients, which can lead to flaking or pilling.” If your product is over one year old, it’s time to throw it out and opt for a newer formula. Right now we’re loving the Giorgio Armani Beauty Lip Power Longwear Satin Lipstick and the L’Oréal Paris Colour Riche Les Nus Intense Lipstick.