It's a drawing salve, so just rub some on the boil and put a bandage over it and leave it overnight. It will cause it to come to a head and leak puss. I've had mixed experiences with it, for big lesions under the skin it brings it to a head and helps alleviate pain quickly. But most of my boils are large collections of smaller spots that aren't as inflamed, so drawing salve doesn't do much for them. Here's a link https://www.amazon.com/dp/B0089UN898/ref=cm_sw_r_cp_apa_i_jTypFb0DGZ69H