Health condition
Delusional infestation: getting real help
Delusional infestation is a condition in which a person experiences the fixed conviction - accompanied by vivid sensations - that their skin is infested with insects, mites or fibres despite negative examinations; specialist clinics can and do help, and the suffering it causes deserves treatment, not dismissal.
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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Core features: crawling, biting or burrowing sensations with an unshakeable conviction of infestation, often with samples collected for inspection (the "specimen sign")
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Genuine causes must always be excluded first: scabies, other itchy dermatoses, iron deficiency, thyroid, liver and kidney disease, neuropathy, and medication or stimulant effects
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Secondary skin damage from scratching, digging and repeated disinfection is common and needs care in its own right
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Treatment that works: a sustained, respectful clinical relationship, skin-directed care, and low-dose antipsychotic medication, which achieves substantial improvement in most who take it
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 sensations in delusional infestation are not imagined - the nervous system is genuinely producing them - and this distinction shapes good care: the disagreement is only about their cause. People affected have typically cleaned, treated and inspected exhaustively, often consulting pest controllers and multiple doctors, and arrive exhausted, sleep-deprived and braced for dismissal; household members can share the conviction (folie à deux), and pets are sometimes treated repeatedly too.
Diagnosis and treatment routes
The specialist pathway begins with the full workup any new patient deserves - skin examination and scrapings, microscopy of collected samples, blood screening and a medication and substance review - both for accuracy and because being investigated properly builds the trust on which everything else depends. Treatment then combines repair of damaged skin, sleep and mood support, and gradual introduction of medication (commonly low-dose risperidone or amisulpride, framed accurately as reducing the sensations); joint dermatology-psychiatry clinics report improvement or remission in the majority who continue care. 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 dermatologist, ideally in a combined dermatology-psychiatry clinic. 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 Delusional infestation: getting real help.
Quick, plain-English answers to what people ask us most.
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What is delusional infestation?
Delusional infestation is a condition in which a person experiences the fixed conviction, accompanied by vivid sensations, that their skin or body is infested with parasites, insects, or other organisms, despite no evidence of actual infestation.
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What causes delusional infestation?
It can occur on its own or alongside other conditions such as depression, substance use, or certain medical or neurological conditions, and the exact underlying mechanism isn't fully understood, though it's considered a genuine psychiatric or neuropsychiatric condition.
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What are the symptoms of delusional infestation?
Symptoms include a firm, unshakeable belief in skin infestation, real sensations of crawling or itching, and often skin damage from repeated scratching or attempts to remove the perceived parasites.
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Is delusional infestation dangerous?
It can lead to significant skin damage from repeated scratching or use of harmful substances to try to eliminate the perceived infestation, and can cause considerable distress and social withdrawal, so appropriate treatment matters.
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How is delusional infestation treated?
Treatment often involves antipsychotic medication, which can be effective even when the person doesn't accept a psychiatric explanation for their symptoms, alongside building a trusting therapeutic relationship and treating any skin damage.
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How do you get help for delusional infestation when the person doesn't believe it's psychiatric?
This is a genuine challenge - building trust and often starting with dermatological care for the skin damage can help create an entry point to treatment, sometimes working with combined dermatology-psychiatry clinics experienced in this specific presentation.
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Can delusional infestation be cured?
Many people respond well to appropriate antipsychotic treatment, though the condition can be chronic for some, and ongoing support and treatment adherence are often needed for sustained improvement.
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Delusional infestation vs a genuine parasitic skin infection - how can you tell the difference?
A genuine infestation can usually be confirmed through skin examination and testing, whereas delusional infestation persists despite negative findings on thorough medical assessment - proper examination is essential to rule out an actual infestation first.
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How can family members support someone with delusional infestation?
Gently encouraging medical assessment (perhaps framed around the skin symptoms rather than directly challenging the belief), avoiding direct confrontation about the delusion, and helping connect them with specialist combined dermatology-psychiatry services can be genuinely helpful approaches.
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When should someone seek specialist help for delusional infestation?
Seek specialist assessment as soon as this pattern is recognised, ideally through a combined dermatology-psychiatry clinic if available, since earlier engagement with appropriate treatment tends to improve outcomes and reduce skin damage.