Can cosmetics spoil even if the expiration date hasn't passed?

Even if the expiration date is well off, cosmetics can spoil depending on how they were stored. If the product emits a strange odor, changes color, leaks an unusual liquid, separates into layers, or the container is swollen, it is highly likely that the product has spoiled, so it is best to discard it immediately. Cosmetics should be stored in a cool place where the temperature and humidity are not high. In particular, it is advisable to avoid keeping them in humid areas like bathrooms. Additionally, storing them in places that are too cold, such as refrigerators, is said to be detrimental as it often causes the ingredients to separate. It would also be beneficial to write the opening date on the product itself before use.

Source https://post.naver.com/viewer/postView.naver?volumeNo=32065941&memberNo=54067778