From the article: Latisse: An FDA-approved Treatment for Longer Eyelashes
Latisse is an FDA-approved prescription eyelash treatment that claims to make your eyelashes longer, fuller and darker. Although rare, potential side effects may occur while using the treatment including allergic reactions, excess hair growth outside the treatment area, and permanent changes in iris and eyelid pigmentation. If you would consider using it, despite the known risks and side effects, why would you do so? If you've used Latisse, why did you decide to use it?

