Tea tree oil of course (1 drop on the spot in the morning, 1 at night). Hot and cold compresses (one after the other)work very well too. But the most important thing with spots is to be very, very hygenic with them, don't touch them with dirty fingers.
my girlfriend swears by sudocrem (mainly for babies nappyrash) in a little grey tub, she applies it like war paint before bed, but it seems to do the trick. She says its amazing!!