Latisse® is the only FDA approved treatment for thinning eyelashes. It is applied to the base of the eyelashes once a day and causes the eyelashes to grow longer, fuller, and darker. Enhanced lashes will become noticeable in about 4 weeks. It is important to have a full eye exam if you are considering Latisse® because it may cause redness or itching. Rarely, it can cause permanent increased brown pigmentation of the iris (colored part of the eye), or temporary eyelid skin darkening.