The reason for the brush applicators is to allow precise application of Latisse just to the base of the lashes, and that is the only place where the skin may darken. If it is applied carefully, it will not spread this effect beyond the lash line. With blinking, some is transferred to the lower lash line, and darkening may occur here also. The large blotchy darkening that is talked about is from patients who used Lumigan for glaucoma as an eye drop, which is the same medication. In these patients, some of the medication was blinked out onto the entire lid area, and in some cases caused a darkening around the eye over a larger area. Fortunately, even if this happens, the effect on the skin is temporary and will fade with time once the medication is discontinued.