Synopsis
Recognise unstable pustular or erythrodermic psoriasis, distinguish sterile inflammation from infection and drug reactions, stabilise physiological threats, and support immediate specialist-directed treatment.
- Generalised pustular psoriasis causes widespread tender erythema studded with superficial sterile pustules; erythroderma means near-generalised inflammation and scale with systemic barrier failure.
- NICE requires immediate same-day specialist assessment and treatment for generalised pustular psoriasis or erythroderma.
- Perform ABCDE, full observations, core temperature, fluid balance and urine output; assess sepsis, cardiac strain and venous thromboembolism risk in parallel.
- Take a dated timeline of psoriasis therapies, systemic corticosteroid exposure, new medicines, infection, pregnancy and adherence; do not abruptly stop an effective systemic agent without specialist direction.
- Skin pain, mucosal erosions, dusky targets, blisters or detachment should redirect urgently toward severe drug reaction rather than being absorbed into a psoriasis label.
- Initial tests include blood count, inflammatory markers, renal and liver profile, calcium, magnesium, albumin, cultures when infection is possible, and pregnancy testing where relevant to treatment.
- Provide gentle emollient skin care, non-adhesive dressings, warmth and carefully monitored replacement while specialist therapy is selected; avoid irritant topicals over vast inflamed areas.
- Systemic choice is consultant-led: NICE supports ciclosporin when rapid control is needed and acitretin for pustular forms, with phenotype, comorbidity, pregnancy potential and organ function governing selection.
Key red flags
Fever, tachycardia, hypotension, reduced urine output, confusion, shivering, oedema or breathlessness indicates physiological compromise and requires emergency assessment.
Skin pain, dusky areas, blisters, epidermal detachment, mucosal erosions or a recent high-risk medicine suggests severe cutaneous adverse reaction rather than assuming psoriasis.
Purpura, rapidly spreading warmth, focal fluctuance, positive sepsis features or disproportionate pain raises concern for invasive infection requiring immediate antimicrobial and surgical assessment.
Pregnancy with generalised pustulation is a specialist emergency because maternal electrolyte disturbance and placental or fetal complications may occur.
Sheets of small superficial non-follicular pustules develop on hot tender inflamed skin and may merge. Pustule contents are not assumed infectious, but fever and neutrophilia cannot distinguish sterile inflammation from sepsis.
Most of the skin becomes inflamed, warm and scaly, sometimes obscuring original plaque borders. In deeply pigmented skin, widespread darkening, violaceous change and heat may be more apparent than redness.
Shivering, oedema, thirst, oliguria, hypotension, confusion or temperature abnormality indicates physiologic loss through diseased skin. Record weight and input-output as well as the rash extent.
New medicine exposure, facial oedema, mucosal disease, targetoid or dusky lesions, skin pain, blistering, eosinophilia or internal-organ injury makes a severe cutaneous adverse reaction more likely.
Investigation priorities
Detect shock, respiratory compromise, temperature disturbance, acute kidney injury and fluid loss immediately.
Management branches
Generalised pustulation or near-total inflammation, particularly with systemic symptoms or abnormal observations.
- Call dermatology and acute medical services immediately, use ABCDE, establish monitoring and assess whether higher-acuity care is required.
- Measure input-output, urine, electrolytes, albumin, temperature and weight; give carefully titrated fluid and electrolyte replacement with cardiac and renal reassessment.
- Use bland emollient, gentle handling, non-adhesive dressings and a thermally controlled environment; avoid stripping scale or applying irritant active products across extensive skin.
- Take indicated cultures and start sepsis treatment promptly when infection is suspected; obtain analgesia, nutrition, thromboprophylaxis assessment and medication reconciliation.
Physiology stable, skin improving and a safe ongoing plan agreed.
- Document the most likely trigger, medicines stopped or continued, laboratory recovery, current systemic regimen, monitoring owner and exact escalation symptoms.
- Provide sufficient topical and systemic treatment, written dosing and rapid access if pustules, diffuse inflammation, fever or reduced urine recur.