Wondering if anyone has noticed an increase in sun spots on their...

It's melasma, aka "mask of pregnancy." Its not exclusive to Yasmin as it can happen with any hormonal form of birth control. It happens when your body gets an increase in hormones - either pregnancy, hormonal birth control, or hormone replacement therapy. A tiny bit of sun will darken it like crazy, so you need you need to use a high SPF with zinc and titanium dioxide. There isn't a cure, but there is a cream (Tri-Luma) that will lighten it. See your dermatologist about it if it really bothers you, but trust me, the sun will forever be an enemy to your face.