This works - Skin Doctor

I still get the occasional spot or pimple.  This stuff, attractively called Zit Zapper by Australian company Skin Doctor is the best thing I've ever tried.  I've woken up inexplicably with a spot before and this clears it up within a day.  At the slightest hint of anything on my face now I put this on before I go to bed by the morning it's gone.  It really does work overnight.
It's a blend of