Clear Signs It's Time to Toss Your Makeup and Skin Care Products

When a product changes color, it means it's been exposed to air for too long. Which means it's no longer working at its optimal level.

"When a product oxidizes, it not only changes color, but is at risk of growing bacteria, particularly if it's stored in a bathroom that gets humid," says Jenny Patinkin, celebrity makeup artist, skin care pro and founder of an eponymous beauty line. This can spell skin care disaster, including infection and breakouts.

She does note that if your product changes color on your skin, like when a foundation turns orangey a few hours after application, it's not necessarily because it's gone bad. Instead, she says, it's usually because it's not compatible with your body's pH.

Image via Imaxtree