Boil, Vinegar or Camphor for

"May be cured by bathing in strong vinegar frequently when they first start. When it stops smarting from the vinegar cover with vaseline or oil." Bathing the boil in vinegar seems to check the growth and does not allow them to become as large as they would ordinarily. If you do not have vinegar in the house, camphor will answer the same purpose.

Source: Mother's Remedies: Over One Thousand Tried and Tested Remidies from Mothers of the United States and Canada, T. J. Ritter