Your lipstick probably smells because it's expired.
Here's a more detailed breakdown:
Expired cosmetics, including lipstick, can develop an off-putting smell due to the breakdown of ingredients. Over time, oils can go rancid, preservatives can lose their effectiveness, and the formula can degrade, leading to unpleasant odors.
Here's why your lipstick might be smelling bad:
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Expiration: Lipsticks do expire. Even if unopened, they have a shelf life, usually around 1-2 years after opening. After this period, the ingredients begin to degrade, leading to changes in smell, texture, and color. Refer to the Period After Opening (PAO) symbol on your lipstick packaging, which looks like an open jar with a number and the letter "M" (e.g., 12M for 12 months).
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Ingredient Degradation: The oils and waxes in lipstick can go rancid over time, causing a stale or sour smell. This is a natural process, especially if the lipstick is exposed to air, heat, or sunlight.
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Bacterial Contamination: While preservatives are included in lipstick formulas to prevent microbial growth, they can become less effective over time. This can allow bacteria to grow, leading to an altered smell.
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Improper Storage: Storing lipstick in a warm or humid environment can accelerate the degradation process and promote bacterial growth.
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Formula Change: If a previously pleasant-smelling lipstick has changed its scent, it's a strong indication of expiration.
What to do:
If your lipstick smells bad, it's best to discard it. Using expired lipstick can cause skin irritation or infection. Even if the smell isn't strong, changes in texture or color can also indicate that it's time to replace your lipstick. To extend the life of your lipsticks, store them in a cool, dry place away from direct sunlight.
