Cosmetics can cause surprising problems. Is your mascara clumpy? Your liquid foundation thickening? Can’t remember what year you bought your half-used lipstick? Dermatologists say your old makeup may be causing you blemishes or even worse?it could lead to a dangerous infection.

Dermatologist Angela Bowers warns that old makeup could be harboring dangerous bacteria. So how do you know when to throw them out? Bowers says, “It’s difficult to know because cosmetics usually don?t include expiration dates.”
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