For all of those with acne - sometimes a zinc supplement will make acne better - a clue that you might need some zinc is white spots on your fingernails.
Zinc oxide cream: This is very inexpensive and it should be somewhere near the band aids and neosporin section at the store. Just dab on heads at night and in the morning they are dried up. If they're small then the zinc oxide will draw out more pus resulting in it being bigger than before you put it on. Just use the creme again and it will dry up the whitehead.