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http://orthomolecular.org/library/jom/1995/pdf/1995-v10n0304-p177.pdf
Above all, drink lots of
water and increase dark greens for the D and chlorophyll (internal
soap for humans). Avoid sugar because though sugar can (sometimes) draw infection out when used topically, internally sugar increases opportunity for friendly environments for unfriendly things.
If the boil is not on or around the eye, like a stye, a warm water compress serves well
enough. Though I've heard not to pop them, the few I had were so painful I popped them anyway. Then ran Hyrdogen Peroxide over 2x / 3x a day until healing was apparent, which was a few days.
Per the paper above, zinc can help however little goes a long way with zinc. And it should be a bioavailible form. Sometimes topical zinc ('Butt Paste' for babies) can help. If you're not sure how much zinc to take, find a salve with zinc, smear a little on the soft, transdermal areas of your feet, add socks. and your body will absorb what it needs.
Taking more vitamin C can expedite healing by helping adrenal glands respond better.
Vitamin D is really a 'master steroid' and touches all hormone function. A preventative measure might be adding more sources of vitamin D to the diet.
Though a trauma or extended deficiency can be a
root cause, usually by the time we feel uncomfortable there is more than one thing happening. Check the diet for overdoing sugar or under doing important nutrients. A good springboard for that is
http://www.doctoryourself.com There is also an excellent reference book for self-advocates titled, '
Nutrition Tests For Better Health' by Cass Ingram.