Health condition
Fixed drug eruption
A fixed drug eruption is a curious, diagnostic drug reaction: one or a few round red-purple patches that reappear at exactly the same skin sites every time the culprit medicine is taken, healing with long-lasting dark pigmentation.
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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Round, well-demarcated red-violet patches - sometimes blistering - recurring at identical sites within hours of each drug exposure
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Favoured sites: lips, hands, genitals; lesions heal leaving a characteristic slate-grey mark
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Common culprits: paracetamol, NSAIDs, co-trimoxazole and other sulfonamides, tetracyclines and some laxative components
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Intermittently taken, over-the-counter medicines are classic offenders - which is why the connection is so often missed
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 reaction is "fixed" because memory T-cells reside permanently in the affected patch of skin, reactivating within 30 minutes to a few hours whenever the drug returns - each episode may add new sites while the old ones flare on cue. Because the triggers are often as-needed painkillers or antibiotics taken sporadically, people can have years of "recurring patches" without linking them to a tablet.
Diagnosis and treatment routes
A dermatologist makes the diagnosis from the story and morphology, occasionally confirmed by cautious patch testing on a previously affected site once things have settled; widespread bullous fixed drug eruption is an exception that needs urgent care as it can mimic TEN. Management is identifying and permanently avoiding the culprit (and its chemical relatives), with a short course of topical steroid for the acute flare - the residual pigmentation fades slowly over months to years. 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 Fixed drug eruption.
Quick, plain-English answers to what people ask us most.
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What does fixed drug eruption mean?
Fixed drug eruption is a condition your doctor may diagnose based on your symptoms, medical history and, where needed, examination or test results. Understanding exactly how it applies to your situation is best done with a clinician who can look at your full picture rather than relying on general information alone.
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What are the risk factors for fixed drug eruption?
Fixed drug eruption can arise from several different underlying mechanisms, and in many cases more than one factor contributes. Identifying likely causes usually forms part of the initial specialist work-up.
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What are the symptoms of fixed drug eruption?
Symptoms of fixed drug eruption vary from person to person and can range from mild and easily missed to significant enough to affect daily life. Because overlapping conditions can produce similar symptoms, a clinical assessment is the most reliable way to confirm what's actually going on.
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Can fixed drug eruption cause complications?
Most cases of fixed drug eruption are manageable with appropriate care, though, like many conditions, it can occasionally lead to complications if left unassessed or untreated. Your clinician can give you a realistic sense of the risks based on your specific presentation.
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Is fixed drug eruption hereditary?
In most cases fixed drug eruption isn't straightforwardly inherited, though family history can sometimes be a relevant background factor. A clinician can help you understand whether it's worth mentioning relatives' health when being assessed.
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Is there a cure for fixed drug eruption?
Fixed drug eruption can often be managed effectively, and in some cases prevented or reversed, with the right combination of lifestyle changes, medication or other targeted treatment. A specialist will tailor the approach to your circumstances rather than applying a one-size-fits-all plan.
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How is fixed drug eruption treated?
Treatment for fixed drug eruption is usually built around the severity of your symptoms and any underlying cause found on assessment, and may involve lifestyle measures, medication, physiotherapy or, in some cases, a procedure. Your specialist will discuss the pros and cons of each option with you before agreeing a plan.
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What's the outlook for fixed drug eruption?
The outlook for fixed drug eruption varies widely depending on the underlying cause, how early it's diagnosed, and how it responds to treatment. Many people see significant improvement with appropriate care, and your specialist can give you a more personalised timeframe once they've reviewed your case.
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Could fixed drug eruption be confused with another condition?
Because several conditions can share similar symptoms to fixed drug eruption, clinicians often consider a short list of possibilities before confirming a diagnosis. This is one of the main reasons a proper assessment, and sometimes targeted tests, matters more than relying on symptoms alone.
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When should I see a doctor about fixed drug eruption, and how quickly can I be seen privately?
It's worth seeking medical advice if symptoms of fixed drug eruption are persistent, worsening, or affecting your daily life, rather than waiting for them to resolve on their own. NHS routine referrals for this kind of assessment can take anywhere from around 20 to 45+ weeks, whereas private consultants typically offer an appointment within about two weeks.