Quick read
Key points
- 1
A boil is a painful, pus-filled lump that forms under the skin, usually caused by a bacterial infection of a hair follicle. A carbuncle is a cluster of connected boils, often causing more significant pain and sometimes fever, and tends to take longer to heal.
- 2
Topic-specific prevention and risk reduction will be added during the article-specific evidence audit.
- 3
The boil or carbuncle is large, very painful, or not improving
01 · Know
What is Boils and Carbuncles?
A boil is a painful, pus-filled lump that forms under the skin, usually caused by a bacterial infection of a hair follicle. A carbuncle is a cluster of connected boils, often causing more significant pain and sometimes fever, and tends to take longer to heal.
Many boils drain and heal on their own within a couple of weeks, but larger boils and carbuncles often need medical treatment, such as drainage or antibiotics, to resolve fully and prevent the infection from spreading.
02 · Understand
Clinical context
Recurrent boils may need further investigation
If boils keep recurring, it's worth discussing with a doctor, since underlying factors like diabetes or a persistent bacterial carrier state, such as with Staphylococcus aureus, can sometimes contribute and may need addressing.
03 · Act
When to See a Doctor
- 1The boil or carbuncle is large, very painful, or not improving
- 2You have a fever or feel generally unwell
- 3You have diabetes or a weakened immune system
- 4Boils keep recurring
04 · Prevent & manage
Practical steps
Never Squeeze or Try to Pop a Boil Yourself
Squeezing a boil can push the infection deeper into the skin or spread it to surrounding areas — let it drain naturally or have it properly treated by a healthcare professional.
- 1Apply a warm compress several times a day.This can help the boil come to a head and drain naturally.
- 2Keep the area clean.Wash your hands before and after touching the area, and keep any drainage covered with a clean dressing.
- 3See a doctor for larger boils or carbuncles.These often need proper drainage and sometimes antibiotics to fully resolve.
- 4Avoid sharing towels or personal items.This reduces the risk of spreading the infection to others.
- 5Take antibiotics if prescribed, completing the full course.This helps clear the infection fully and reduce the risk of recurrence.
Evidence
References
BarnMD Health Intelligence uses authoritative and clinically relevant sources appropriate to the topic. References are shown so readers can inspect the evidence directly.
- NHS: Boils ↗
Medical information notice
Health education, not individual medical advice
BarnMD Health Library provides general health education for public health literacy. Reading this article does not establish a doctor-patient relationship and this information is not a diagnosis, prescription, or personalised treatment plan. If you have symptoms or concerns about your health, seek appropriate advice from a qualified healthcare professional. If you develop emergency warning signs, seek urgent or emergency medical attention.
BarnMD Bottom Line
Boils and carbuncles are common skin infections that usually resolve well with proper care, whether at home or with medical treatment.
Recurrent boils are worth discussing with a doctor to check for any underlying contributing factors.