Health condition
Primary cutaneous amyloidosis
Primary cutaneous amyloidosis is a group of skin-limited conditions in which altered keratin protein is deposited in the upper dermis, causing intensely itchy rippled brown patches (macular type) or firm bumps on the shins (lichen amyloidosis) - it does not involve internal organs.
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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Macular amyloidosis: rippled, greyish-brown pigmentation, typically across the upper back and between the shoulder blades, with itch that precedes the pigment
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Lichen amyloidosis: intensely itchy, firm, dome-shaped papules on the shins that merge into thickened plaques
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The deposits are keratin-derived - this skin-limited form does not progress to systemic (AL) amyloidosis, which is a different disease
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Breaking the itch-scratch cycle is the treatment: potent topical steroids under occlusion, capsaicin, phototherapy, and oral options for severe 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
The sequence usually starts with itch: repeated scratching and friction (nylon towels and back-scratchers are classic culprits) damages keratinocytes, whose altered keratin is then laid down as amyloid in the dermis, producing pigmentation and papules that are themselves itchy - a self-sustaining loop. The condition is commoner in people of South-East Asian, Middle Eastern and South American ancestry, and familial forms exist.
Diagnosis and treatment routes
A dermatologist can usually recognise the patterns clinically, with biopsy confirmation available, and importantly can reassure that no systemic screening is needed for these keratinocyte-derived forms - unlike nodular or systemic amyloidosis, which involve different proteins. Management focuses on halting friction, super-potent steroids or intralesional injection for lichenified plaques, menthol and capsaicin for itch, narrowband UVB, and reports support oral retinoids or dupilumab in resistant cases. 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 consultant dermatologist. 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 Primary cutaneous amyloidosis.
Quick, plain-English answers to what people ask us most.
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What is primary cutaneous amyloidosis?
Primary cutaneous amyloidosis is a skin condition where abnormal protein deposits (amyloid) build up specifically within the skin, without involvement of other organs, causing characteristic skin changes and often significant itching.
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What causes primary cutaneous amyloidosis?
The exact cause isn't fully understood, but it's thought to relate to chronic skin rubbing or scratching leading to abnormal protein deposition in some forms, with genetic factors also playing a role in certain cases.
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What are the symptoms?
Itchy, often symmetrical, rippled or bumpy skin patches, commonly on the shins or upper back, are typical, with the itching sometimes being severe and significantly affecting quality of life.
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Is primary cutaneous amyloidosis dangerous?
No, unlike systemic amyloidosis affecting internal organs, primary cutaneous amyloidosis is confined to the skin and doesn't pose a risk to other organs, though the persistent itching can be very troublesome.
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Can primary cutaneous amyloidosis be treated?
Treatment focuses on managing the itching and skin changes, using topical steroids, other anti-itch treatments, and sometimes light therapy (phototherapy), though results can be variable, and it can be a challenging condition to fully resolve.
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How is primary cutaneous amyloidosis diagnosed?
A skin biopsy showing the characteristic amyloid protein deposits confirms the diagnosis, distinguishing it from other itchy skin conditions with a similar appearance.
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How long does treatment take to help?
This varies considerably, with some improvement in itching often achievable within weeks of starting treatment, though the underlying skin changes can be more persistent and challenging to fully clear.
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Primary cutaneous amyloidosis vs systemic amyloidosis — what's the difference?
Systemic amyloidosis involves protein deposits affecting internal organs such as the heart or kidneys and can be serious, while primary cutaneous amyloidosis is confined to the skin alone without this organ involvement; a biopsy and further testing help confirm this important distinction.
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Does scratching make primary cutaneous amyloidosis worse?
Yes, chronic scratching or rubbing is thought to contribute to the development and persistence of the skin changes in some forms, so breaking the itch-scratch cycle with appropriate treatment is an important part of management.
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When should I see a dermatologist, and how quickly can I be seen privately?
See a dermatologist for persistent, unexplained itchy skin patches. Private dermatology assessment is typically available within about two weeks, faster than standard NHS dermatology waiting times.