that seems weird...I don't normally get mascara on my face unless it flakes off and falls on my cheeks, and that's a sign of some crappy mascara haha! Is there anything else you use in conjunction with it that might have more contact with your face?
Go see a doctor about it.
You may be allergic to the particular pigments in the mascara or the emollient carrying agent. Either way, we're not qualified to give medical advice and you should consult with a healthcare professional to find out exactly what you're reacting to.