The home remedies for boils include the use of tomato, bitter gourd, tea tree oil, vinegar, garlic juice, onion juice, turmeric, parsley, cumin seeds, betel leaves, castor oil, margosa leaves, water, and saline.
Home Remedies for Boils
There are several home remedies for boils that are easily available and have been found to treat them efficiently. These are summed up below: 
Make a thick paste of tomatoes and apply it on the boils. This is one of the easiest and simplest home remedies to cure this condition. 
Prepare a fresh juice of 3-4 bitter gourds, which are well known for their antimicrobial activity and cleaning of the circulatory system, and then mix a spoonful of lime juice to it. This can be taken daily to eliminate hard, blood-filled boils.
Tea Tree Oil
It is advised to rub a small amount of tea tree oil on your hard boils every night. It is observed that this treatment eliminates the condition in as little as three weeks.
Take a brown paper bag with a size that fits the boiled area. Soak it in vinegar and cover the boils with a bandage. In a day or two, the boil will dry and pop off.
Garlic juice can be applied over the boils, which will cause them to ripen and finally rupture.
Onions play a similar role to garlic and their paste can also be applied to obtain beneficial results. One should also eat more onions if boils are frequently appearing on your body.
Turmeric is known for its healing properties and can be used both externally and internally. The turmeric root powder is mixed with a small amount of milk cream and applied over the boils. Have a cup of hot milk containing a half teaspoon of turmeric powder at night until the pain subsides.
Boil parsley leaves in water. The extract can be applied on the infected area by soaking it into a muslin cloth and wrapping it over the affected region.
Grind a few cumin seeds in water to obtain a paste. This paste can be applied over the boils to get beneficial results.
Betel Leaves and Castor Oil
Betel leaves are kept in warm water for a certain amount of time until they soften. They are now coated with a castor oil layer and can be used to cover the affected area. This can be repeated several times a day until the boils disappear.
Margosa, which is called ‘Neem’ in Hindi, is a well-known blood purifier as well as a germ remover. This plant is famous worldwide as the best cure for boils. Neem leaves can be ground to obtain a paste that can be applied to the inflamed region. Otherwise, ‘neem’ paste or a few leaves can be taken on an empty stomach with water every morning to protect your skin and keep it acne-free. 
Plenty of Water
One must drink at least two liters of water every day to keep the body free from boils.
As per the National Health Library, it is advisable to soak a cloth in warm saline water and press on the carbuncle gently.
Maintaining proper hygiene, using separate towels, bed sheets, pillows, and other items of daily use and bathing properly can help to a great extent.
One should also maintain a healthy balanced diet, avoid alcohol, exercise regularly, and use antiseptic soaps for daily purposes.