Health condition
SAPHO syndrome: the bone lesions
SAPHO syndrome combines Synovitis, Acne, Pustulosis, Hyperostosis and Osteitis: sterile inflammation of bone - classically the collarbone-breastbone region - paired with pustular skin disease; recognising the pattern spares patients biopsies and cancer scares.
Why trust this guide
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Editorial team
Written by our editorial team from the UK sources listed on each page.
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Sourced from guidance
Checked against current NHS and UK specialist society guidance at the time of review.
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Current for 2026
Reviewed on 2026-09-27 with the next review scheduled for 2027-09-27.
Key facts
The essentials at a glance.
The symptoms to recognise, when to seek help, which specialist to see, and what treatment usually involves.
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The signature is inflammatory pain and swelling of the anterior chest wall (sternoclavicular region), with X-ray/MRI showing hyperostosis and osteitis
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Skin involvement - palmoplantar pustulosis or severe acne - may precede, follow or never accompany the bone disease
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Bone scintigraphy showing the "bull’s head" sign of tracer uptake across the sternoclavicular region is characteristic
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Treatment ladder: NSAIDs first, then bisphosphonates (notably pamidronate), methotrexate or TNF/IL-17 biologics for persistent disease
Understanding the condition
What it is and what happens next.
What causes it, how it is diagnosed, and the treatment routes available in the UK.
What it is and how it feels
SAPHO sits on the spectrum between rheumatology and dermatology: the bone lesions are sterile osteitis - inflammation without infection - yet they can look aggressive on imaging, and a swollen, hot sternoclavicular joint in an adult routinely triggers investigations for infection or malignancy before anyone asks about pustules on the palms. Vertebral involvement, sacroiliitis and mandibular osteitis are all recognised, and the course typically relapses and remits over years.
Diagnosis and treatment routes
Assessment brings the elements together - examination of skin including soles and scalp, inflammatory markers, cross-sectional imaging and a whole-body bone scan mapping typical sites - with biopsy reserved for genuinely atypical lesions, where cultures are sterile and histology shows chronic inflammation. NSAIDs control many; intravenous pamidronate has a strong track record for refractory bone pain, and biologics help those with persistent inflammation, while dental review matters when the jaw is involved. In much of the UK, a routine NHS referral to the relevant specialist clinic can take several months, whereas an initial appointment with a private consultant is typically available within around two weeks.
Seeing a specialist
Who to see, and how quickly you can be seen.
The specialist for this condition is usually a rheumatologist with metabolic bone input. Your GP can refer you on the NHS, or you can arrange a private consultation directly.
A quiet reminder
This guide is for information, not medical advice.
Your GP knows your history and can tell you which parts apply to you. If in doubt, see them - and seek urgent care for any of the emergency symptoms described above.
Frequently asked
Common questions about SAPHO syndrome: the bone lesions.
Quick, plain-English answers to what people ask us most.
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What are the bone lesions in SAPHO syndrome?
SAPHO syndrome combines Synovitis, Acne, Pustulosis, Hyperostosis and Osteitis - the bone lesions are sterile inflammation of bone, classically affecting the collarbone-breastbone region, causing chronic pain and swelling.
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What causes the bone lesions in SAPHO syndrome?
The bone inflammation is thought to result from an abnormal immune response, without actual infection present despite sometimes appearing similar to bone infection on imaging, and it's often associated with skin conditions like acne or pustulosis.
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What are the symptoms of SAPHO bone lesions?
Symptoms include chronic, often relapsing pain and swelling, most classically at the front of the chest where the collarbone meets the breastbone, alongside associated skin symptoms.
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Is SAPHO syndrome bone involvement dangerous?
It is not usually dangerous but can be chronically painful and, if repeated episodes affect bone density, needs monitoring alongside metabolic bone assessment.
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How are SAPHO bone lesions treated?
Treatment includes anti-inflammatory medication, and for more persistent cases, medications such as bisphosphonates or disease-modifying drugs used in other inflammatory arthritis conditions.
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How are SAPHO bone lesions diagnosed?
Diagnosis involves imaging showing the characteristic bone changes, alongside excluding actual infection (which can look similar), often requiring a combination of scans and sometimes biopsy.
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SAPHO bone lesions vs bone infection - what's the difference?
Bone infection (osteomyelitis) involves actual bacteria within the bone and needs antibiotics, whereas SAPHO's bone inflammation is sterile and needs anti-inflammatory rather than antibiotic treatment - a distinction confirmed through careful investigation.
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When should I see a specialist about SAPHO bone symptoms?
See a doctor for chronic chest wall pain and swelling, particularly with associated skin symptoms. A private rheumatologist with metabolic bone input can typically be seen within about two weeks.