Pustular Psoriasis: Symptoms, Types and What Australians Research
Pustular psoriasis is one of the less common but more clinically significant forms of psoriasis — a condition characterised by white or yellow pustules (blisters filled with non-infectious fluid) on areas of red, inflamed skin. For Australians researching pustular psoriasis, the condition can be confusing to understand because it differs significantly in appearance and severity from the more familiar plaque psoriasis that most people associate with the term psoriasis.
This guide covers what pustular psoriasis is, how it differs from other forms of psoriasis, what the main subtypes are, what symptoms are commonly reported, and when professional medical assessment is essential. It is an educational resource — not medical advice, and not a substitute for assessment and treatment guidance from a GP or dermatologist.
What Is Pustular Psoriasis?
Pustular psoriasis is a form of psoriasis in which the characteristic skin changes include pustules — small, raised blisters filled with white or yellow fluid — appearing on areas of red, inflamed skin, rather than the silvery-scaled plaques of classic plaque psoriasis.
Like all forms of psoriasis, pustular psoriasis is driven by an overactive immune response — the same underlying autoimmune mechanism that drives plaque psoriasis, but manifesting in a different pattern of skin changes. The pustules in pustular psoriasis are not caused by infection and are not contagious — the fluid within them is not pus in the infectious sense but a collection of white blood cells (neutrophils) that have migrated to the skin surface as part of the inflammatory response.
Pustular psoriasis can occur in people who have previously had plaque psoriasis, as a new presentation in people with no prior psoriasis history, or occasionally as a transformation from another psoriasis subtype triggered by specific factors such as medications, infections, or withdrawal from certain treatments.
According to DermNet NZ on pustular psoriasis, pustular psoriasis accounts for a small proportion of all psoriasis cases but carries a significantly higher risk of serious complications than plaque psoriasis — particularly the generalised form, which can be a medical emergency.
How Does Pustular Psoriasis Differ from Plaque Psoriasis?
The most important distinction between pustular psoriasis and plaque psoriasis is in the appearance of the skin lesions and the potential severity of systemic involvement.
Plaque psoriasis — the most common form, affecting the majority of people with psoriasis — produces raised, well-defined plaques covered with thick silvery-white scale. The plaques are chronic, relatively stable, and while they cause significant discomfort, they rarely represent a medical emergency.
Pustular psoriasis produces a different pattern — areas of red, tender, inflamed skin covered with or surrounded by pustules rather than scale. In the generalised form, this can develop rapidly across large areas of the body and be accompanied by fever, chills, and significant systemic illness — a presentation that requires immediate medical attention.
The two forms can coexist — some people with plaque psoriasis develop pustular episodes either spontaneously or triggered by specific factors — and pustular psoriasis can evolve into or from other psoriasis subtypes over time.
Types of Pustular Psoriasis
Pustular psoriasis is not a single condition but a group of related subtypes that differ significantly in distribution, severity, and clinical course.
Generalised Pustular Psoriasis (Von Zumbusch)
Generalised pustular psoriasis — also called Von Zumbusch psoriasis — is the most severe subtype and represents a dermatological emergency. It is characterised by the sudden onset of widespread red, painful, burning skin across large areas of the body, followed rapidly by the eruption of sheets of pustules that may coalesce and dry to leave areas of scaling.
Generalised pustular psoriasis is typically accompanied by significant systemic symptoms including fever (often high), chills, malaise, fatigue, and in severe cases can affect organ function. Anyone experiencing the sudden onset of widespread red, burning skin with pustule formation must seek emergency medical assessment immediately — this is not a condition that should be self-managed.
Triggers for generalised pustular psoriasis include abrupt withdrawal of systemic corticosteroids, certain medications (including some antibiotics, non-steroidal anti-inflammatory drugs, and other medications), infections, and pregnancy.
Palmoplantar Pustular Psoriasis
Palmoplantar pustular psoriasis affects specifically the palms of the hands and soles of the feet — producing crops of pustules on these areas that cycle through stages of appearing yellow-white, darkening to brown, and then drying and scaling before new pustules form. This subtype is significantly less dangerous than generalised pustular psoriasis but can be chronically disabling due to the impact on hand and foot function.
Palmoplantar pustular psoriasis has a particularly strong association with smoking — smokers have a substantially higher risk of developing this subtype than non-smokers, and smoking cessation is one of the most consistently recommended management steps for people with this form of the condition.
Acrodermatitis Continua of Hallopeau
Acrodermatitis continua of Hallopeau is a rare subtype of pustular psoriasis that affects the fingers and toes — typically beginning around or beneath the nail and spreading to involve the surrounding skin. It can cause significant nail damage and in severe or longstanding cases can lead to permanent nail loss and bone resorption in the affected digits.
Annular Pustular Psoriasis
Annular pustular psoriasis is a subtype characterised by ring-shaped (annular) configurations of pustules on red, inflamed skin — the pustules form at the expanding edge of the ring as the centre clears. This form is generally less severe than generalised pustular psoriasis and more localised in distribution.
Symptoms of Pustular Psoriasis
The symptom experience of pustular psoriasis varies significantly between subtypes — from the dramatic and potentially life-threatening presentation of generalised disease to the chronic, localised discomfort of palmoplantar disease.
Skin Symptoms
The defining skin feature of all pustular psoriasis subtypes is the presence of pustules — small, raised blisters filled with white or yellow non-infectious fluid on a background of red, inflamed skin. The pustules vary in size and can appear individually, in clusters, or in confluent sheets depending on the subtype and severity.
The skin surrounding and between pustules is typically red, inflamed, tender, and warm to touch — often described as burning rather than itching, particularly in generalised disease. As pustules resolve, they typically dry and crust, leaving scaling skin that then sheds — after which new pustules may form, creating a cyclic pattern of flaring and partial resolution.
Systemic Symptoms in Generalised Disease
In generalised pustular psoriasis, significant systemic symptoms accompany the skin changes — including fever (which can be high), chills, malaise, fatigue, loss of appetite, nausea, and joint pain. The systemic involvement distinguishes generalised pustular psoriasis from localised subtypes and explains why it can be a medical emergency requiring hospitalisation.
Pain and Functional Impact
Pustular psoriasis — particularly the palmoplantar and acrodermatitis subtypes — can be significantly painful and functionally limiting. Pustules on the palms and soles make walking and manual tasks painful or impossible during active flares. The acrodermatitis subtype can affect grip and fine motor function in the hands.
What Triggers Pustular Psoriasis?
Pustular psoriasis can be triggered or worsened by several factors — some of which are also relevant to plaque psoriasis, and some of which are more specifically associated with pustular disease.
Medication-Related Triggers
Certain medications are associated with triggering pustular psoriasis — particularly the abrupt withdrawal of systemic corticosteroids (cortisone medications taken orally or by injection), which is one of the most commonly identified triggers for generalised pustular episodes. Other medications associated with triggering pustular psoriasis include some antibiotics, non-steroidal anti-inflammatory drugs (NSAIDs), lithium, and certain other systemic treatments.
This is one of the reasons that stopping oral corticosteroid treatment abruptly — without medical supervision — carries specific risks in people with psoriasis. Any changes to systemic medication involving corticosteroids should be managed with GP or specialist guidance.
Infections
Upper respiratory tract infections and other systemic infections can trigger pustular episodes — the immune activation in response to infection exacerbating the underlying immune dysregulation driving psoriasis. Streptococcal infections in particular have been associated with triggering psoriasis flares including pustular episodes.
Pregnancy
Pustular psoriasis of pregnancy — also called impetigo herpetiformis — is a specific subtype that can occur during pregnancy, most commonly in the third trimester. It is considered a rare but serious complication of pregnancy requiring specialist obstetric and dermatological management.
Smoking
The association between smoking and palmoplantar pustular psoriasis is one of the strongest lifestyle-related associations in pustular psoriasis research. Smokers have a significantly elevated risk of developing palmoplantar pustular psoriasis, and smoking cessation is associated with improvement in this subtype.
The relationship between psoriasis triggers including smoking and alcohol is covered in detail in our dedicated guide.
Diagnosis of Pustular Psoriasis
Pustular psoriasis diagnosis requires professional medical assessment — it cannot be reliably self-diagnosed, and accurate subtype identification is important because management approaches differ between subtypes.
A GP or dermatologist will typically assess the distribution and appearance of skin changes, review medication and treatment history, consider systemic symptoms, and may perform a skin biopsy to confirm the diagnosis histologically. Blood tests may be performed to assess the degree of systemic involvement, particularly in generalised disease.
The differential diagnosis of pustular psoriasis includes other conditions that produce pustular skin changes — including bacterial and fungal infections, dermatitis, and other inflammatory skin conditions — making professional assessment essential before any management decisions are made.
Treatment Approaches for Pustular Psoriasis
Pustular psoriasis management is directed by a GP or dermatologist — the treatment approach differs between subtypes and severity levels, and self-management with over-the-counter products is not sufficient for most presentations.
Generalised Disease
Generalised pustular psoriasis typically requires hospitalisation for stabilisation — including treatment of fever, fluid management, and systemic treatment to bring the inflammatory flare under control. Systemic treatments including retinoids, ciclosporin, methotrexate, and biological therapies are used depending on the clinical situation. This is managed entirely in a hospital and specialist setting.
Localised Subtypes
Palmoplantar pustular psoriasis and acrodermatitis continua of Hallopeau are typically managed with topical treatments under dermatologist guidance, sometimes supplemented by phototherapy or systemic treatments for more resistant disease. Smoking cessation is a cornerstone recommendation for palmoplantar disease.
Light Therapy
UVB light therapy — including targeted phototherapy for localised pustular psoriasis — is used in some cases under dermatologist supervision. The uvb light therapy at home australia guide covers home UVB options for psoriasis management more broadly, though pustular psoriasis management decisions should always be made with specialist input.
According to Healthdirect Australia, all forms of psoriasis — and particularly less common forms like pustular psoriasis — benefit from professional assessment and treatment guidance rather than self-management alone.
When to Seek Medical Advice
The threshold for seeking medical advice with pustular psoriasis is significantly lower than for plaque psoriasis — and in generalised disease, emergency medical assessment is required.
Seek emergency medical assessment immediately if:
- Widespread red, burning skin develops suddenly across large body areas
- Pustules form rapidly across the trunk, limbs, or face
- Fever, chills, or significant systemic symptoms accompany skin changes
- Existing psoriasis changes suddenly and dramatically
Seek GP assessment promptly if:
- Pustules appear on the hands, feet, or digits that have not been assessed before
- Ring-shaped pustular eruptions develop on the skin
- Any pustular skin change is uncertain in diagnosis
- Existing skin condition changes in character to include pustules
Frequently Asked Questions
What is pustular psoriasis?
Pustular psoriasis is a form of psoriasis characterised by white or yellow pustules — blisters filled with non-infectious inflammatory fluid — on areas of red, inflamed skin. It differs from the more common plaque psoriasis in appearance and can range from localised subtypes affecting the palms and soles to the generalised form which is a medical emergency.
Is pustular psoriasis contagious?
No — pustular psoriasis is not contagious. The pustules contain non-infectious inflammatory fluid, not infectious pus. Like all forms of psoriasis, it is driven by an autoimmune process and cannot be spread from person to person through contact.
What causes pustular psoriasis?
Pustular psoriasis is driven by the same underlying immune dysregulation as other psoriasis subtypes but can be triggered by specific factors including abrupt withdrawal of oral corticosteroids, certain medications, infections, pregnancy, and — particularly for palmoplantar disease — smoking.
How serious is pustular psoriasis?
Severity varies significantly by subtype. Generalised pustular psoriasis is a medical emergency requiring hospitalisation. Localised subtypes such as palmoplantar pustular psoriasis are not emergencies but can be chronically disabling and require specialist management. Any new pustular skin presentation should be assessed by a healthcare professional.
How is pustular psoriasis treated?
Treatment is directed by a GP or dermatologist and varies by subtype and severity. Generalised disease requires hospitalisation and systemic treatment. Localised subtypes are typically managed with topical treatments, phototherapy, and — for palmoplantar disease — smoking cessation. Self-management with over-the-counter products is not appropriate for pustular psoriasis.
Pustular Psoriasis: What Australians Need to Know
Pustular psoriasis is a distinct and clinically significant group of psoriasis subtypes that differ from plaque psoriasis in appearance, severity, and management approach. Understanding the difference between the subtypes — from the localised palmoplantar form to the generalised emergency presentation — is important for Australians who encounter this diagnosis or suspect they may have a pustular form of psoriasis.
Professional medical assessment is essential for any pustular skin presentation — and generalised pustular psoriasis requires immediate emergency attention. The psoriasis scars australia guide covers related post-inflammatory skin changes that can occur after psoriasis flares of any type. The creams and sprays collection at Australian Psoriasis and Eczema Supplies covers topical products for Australians managing psoriasis — always alongside professional guidance for complex presentations like pustular disease.