• Onion juice or garlic juice may be applied on boils externally to ripen them, break and evacuate the pus. Juices of both these vegetables can be mixed in equal quantities and applied on the boil for beneficial results.
  
• Bitter Gourd is also an effective home remedy for blood filled boils. To treat boils, a cupful of fresh bitter gourd juice can be mixed with one teaspoon of lime juice, sipped on slowly on an empty stomach everyday for a few days.

Source: Mumbai Mirror