First, cumin is a SPICE and NOT an herb. With that being said, yes, cumin helps remove boils. Cumin seeds are best though instead of the powder. Cumin seeds are the most popular spice in the world. Besides being used as a flavoring in some recipes, cumin seeds treat various health issues that include sties, boils and more. Cumin seed also help to decrease swelling, redness, inflammation and soreness. Add water to the cumin seeds and grind to a paste. Apply the paste to the boil and gently massage. After the paste dries, clean the area with a soft, damp cloth. The cumin also dries out the boil causing the pus in the boil to "pop." Do NOT pop the boil by hand since this will cause the pus to spread the infection.
Cumin also prevents boils from reoccuring.