In the early stages of a boil or common pimple or even pimples on the face or other parts of the body try dabing them with Turpentine - YES Turpentine. It's a old time remedy for a lot of things. They used to sell small bottles of what was called Rectified Turpentine in drug stores but it's very difficult to find these days. Art supply stores sell it for a high price. Common painters Turpentine works great. At the start of one and several times diring the day dab some Turpenting on the spot. You will be suprised most of the time that it will stop development at that point. I once told a Dermatologist about it and he said that it was highly allergenic. And I told him that it probably worked better than anything he could prescribe and he agreed!
EC: You can still find turpentine in pharmacies and grocery stores throughout the in the USA. It's usually found right next to small bottles of iodine.