All of your cosmetics should be kept in a cool, dry place. If your bathroom is particularly warm (above 75 degrees fahreheit), you may want to find a different location to store your cosmetics. Always keep them out of direct sunlight.

If you are developing an eye infection, it is best to stop using all eye products until it clears up. (I know, easier said than done) If you do have an eye infection, throw out your mascara immediately. Megsmakeup is correct, mascara should be used no more than 3 months. The dark, damp environment inside a mascara tube is great home for bacteria. For this reason, you should also never share mascara.

Here's a link to a Good Housekeeping article about cosmetics shelf life:
http://www.goodhousekeeping.com/beauty/makeup/expired-beauty-products

Several years ago, I had a problem with recurring eye infections and my doctor told me to throw out all my eye makeup. It was tough since there were some really cool colors that were discontinued. I purchased all new stuff, throw it out regularly, and haven't had another infection since.
Source(s):
http://www.goodhousekeeping.com/beauty/makeup/expired-beauty-products

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