Consider replacing foundation or cream-based blush every six months or a year. Powder products, if properly stored and do not contain moisture, are valid for up to two years. Lipstick is good for one or two years, and lip gloss can be used for six months to 1 year. Lipstick will expire over time, even if it isn't opened.
Unopened lipstick is valid for two to five years, depending on the brand and ingredients. Expired lipsticks may contain irritants and bacteria, which can cause itching in and around the mouth. Lipstick has lanolin, which has a complex composition and can easily cause allergic reactions such as dryness, itching and pain.