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Reduce the boil's inflammation with witch hazel. Kill the bacteria in the boil with tea tree oil. Use arnica to reduce the boil's inflammation and swelling.
Witch hazel is a natural astringent that reduces inflammation on the skin. It can also kill the bacteria causing the boil. Pour some onto a cotton ball and rub it onto your boil. Repeat this twice a day to see if the swelling and inflammation goes down. If you have sensitive skin, witch hazel could cause excessive dryness. If you experience any irritation, try making a 50% witch hazel-50% water solution to dilute it. Tea tree oil is a natural antiseptic that can kill the bacteria in skin infections like boils. Get a cream with a 10% tea tree oil concentration and rub it onto the boil once a day. See if your symptoms improve after a week.  If you notice any increased inflammation or pain, stop using the oil right away. You may be sensitive to it. Never use undiluted tea tree oil. Undiluted oils could be toxic. Arnica oil is derived from the arnica flower, which has been used to treat skin inflammation for centuries. Mix 1 tbsp (15 ml) of the oil with 2.1 cups (0.50 L) of water. Then rub the mixture onto the boil and cover it with a dry gauze wrap. Continue the treatment once a day.  Some creams and ointments also contain arnica. You can use a cream with a 15% concentration of arnica oil to treat the boil as well. Never ingest arnica. It's toxic if swallowed. Don't use arnica on broken skin. If the boil pops or starts draining, then stop using the oil.