Boils are painful, red, pus-filled lumps in your skin caused by an infection of hair follicles. You can look after small boils on your own, but you may need to see your doctor for treatment of large boils. If a boil becomes worse or spreads or you develop a fever, you should see your doctor.
What are boils?
Boils are red painful lumps in your skin. They can occur anywhere, but most often in hairy areas that sweat or rub, such as your face, neck, armpits and buttocks.
Boils result from infected hair follicles. One infected hair follicle is a furuncle, and a group of infected follicles joined together is a carbuncle.
- a red lump with a white or yellow centre
- feeling unwell and having fevers, particularly with a large boil
Causes and risk factors
Boils are usually caused by infection with the bacteria Staphylococcus aureus. This bacteria usually lives on your skin without causing harm, but can infect hair follicles if the skin is broken. The infection can spread to other parts of your body, or to other people.
Anyone can develop a boil. You are more at risk if:
- you come into close contact with someone who has a staph infection
- you have diabetes
- you have other skin conditions
- you have a weakened immune system
Boils should be kept clean and covered. It is important not to squeeze boils, as this can be very painful and can spread the infection.
Pus needs to drain before a boil will heal. This may happen by itself, but sometimes treatment is needed.
For small boils, you can put a warm compress on the boil several times a day. This may help the pus to drain.
For larger boils and carbuncles (larger than 5cm), see your doctor. They may need to make a cut in the boil to help the pus drain, and you may need antibiotics. Large boils and carbuncles can scar.
See your doctor if the boil is on your face, if it is getting worse quickly, if it’s very painful or if it hasn’t healed in 2 weeks.
Looking after yourself
If you have boils, you can help them heal more quickly and prevent them from spreading if you:
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Last reviewed: February 2019