Why did I go there! That link about eyelash mites brought back some traumatic memories for me! I used another girl's mascara in high school once and ended up getting these bugs/mites in my eyelashes-like lice. My dad had to hold me down on his lap (I was 17) and pick out each bug with tweezers. I had to go to the ER because he acidentally preforated my eye ball with the tweezers and ended up in an eye patch for 6 weeks! I also had to use lice shampoo on my eyelashes and had to sleep on plastic sheets and pillowcases until they were gone...... It was probably the worst 2 months of my teenage life!
Lesson learned- never share mascara with another!! (also replace yours every 3-4 months to be safe)_