Fresh aloe vera works for drying out many things, spots, cold sores and also boils. I have posted about it in the cold sores section too.
Boils are nasty things and I do find linked to diet. A good probiotic helps to minimize them as does cutting out sugars and hard trans and saturated fats as I detail below.
I am sorry so many of us suffer from these nasty things but I have managed to minimize them by being careful with my diet and when they do come up, acting fast with fresh aloe vera from the plant only.
If a boil develops I do find taking turmeric helps to bring it to a head however once it is oozing you need something to dry it out as soon as possible.
I do find to avoid boils avoid sugar, avoid eating hard fats (eggs, lots of red meat or porc, I keep cheese consumption down and try to mostly eat soft cheeses).
I do find that despite the warning on this page that you want to pop the boil as soon as you can with a sterile needle or other implement and get all the gunk out. Until you have done this it just cannot heal properly.
Once you have gotten all the yucky stuff out I find Fresh Aloe Vera straight from the plant is the most amazing thing for drying it up. The yellow ick should start to dry out and form a brown coloured scab which gets darker and drier by the day. If it is still very swollen and painful after a day it may be because not all the gunk has been extracted in which case lightly press on either side of the boil either with Q-tips or fingers wrapped in tissue paper and see whether more thick white stuff comes out, usually it does if the boil is very swollen. Keep taking the turmeric in water as suggested in other posts here.
Once the thick white stuff is all out of the boil, the boil is usually gross and oozing with that see through pus so you want to dry it up as fast as possible, avoid wetting the sore or taking long showers and baths. Holding a tissue to it for about 30 mins to stop the flow of pus will help, then you start applying aloe vera like crazy!
You should apply fresh aloe vera- the juicy part- straight from the plant every half an hour or so until the boil gradually turns into a scab and then keep on applying as often as you can. Only fresh aloe vera from the plant works, I have tried the bottle stuff and it just does not work the same. I always have an aloe vera plant in the house for these needs and have been known when travelling to bring parts of leaves with me in a ziplock bag!
The best thing is to slice a small amount off the plant and keep it in the bathroom and just keep on applying the juicy liquid as often as you can. Eventually you'll need a fresh piece as the juicy part will dry out.
I have found I can 'cure' a boil in 3 days if I am lucky, with only a minor red mark at the end that is easy to cover with concealer. Usually on the 3rd or 4th day of applying the aloe vera the scab is so tight and dry it easily falls off or peels off, do NOT pull it off if it is still stuck on too tight or you will have a scar and the sore may not be healed properly underneath yet.
If you are sure the boil is really dead and dried out and all scabbed up, another thing that helps the healing is to apply -only when you are 100% sure it is all dried up! Or else you will reactive it- some neosporin. This will help humidify the skin underneath so it heals nicely without leaving a big scar.
Aloe vera, straight from mother nature, from the fresh plant is heaven sent and I thank beautiful nature and mother earth for giving us this wonderful miracle!
My aunt blended a small aloe vera leaf with water in a cup and I haven't had a boil since 1998. I had boils at least once a month. You can also add orange juice instead of water because it helps the bitter taste.