According to a new article in the LA Times, you can just forget about testing makeup at a department store or your local Sephora. Why? Well, its like sharing makeup with thousands of people you know nothing about.

"If a woman has a cut on her lip and borrows lipstick from someone who has a cold sore, she'll get a cold sore," Beverly Hills dermatologist Dr. Zein Obagi tells the LA Times. "You can pass herpes (the cold sore virus), conjunctivitis (pink eye) and all sorts of things through sharing makeup." The FDA stresses the importance of keeping makeup—particularly eye products—to yourself. They caution that, "the risk of contamination may be even greater with ‘testers' at retail stores, where a number of people are using the same sample product."

This is valuable information,which should have every woman thinking twice about testing makeup at a local department store. However, you can always ask the salesperson for a clean tester many stores keep them in stocked.