Synopsis
Recognise a generalised pustular psoriasis flare as a potentially fatal neutrophilic emergency, exclude infection and drug pustulosis, stabilise systemic complications, and apply current specialist systemic and spesolimab criteria safely.
- Generalised pustular psoriasis causes widespread visible or superficial non-follicular pustules on inflamed skin with systemic illness; pustules are sterile unless secondary infection complicates them.
- Pustules may be conspicuous cream-yellow in any skin tone, while background erythema can look red, violaceous, grey-brown or dusky and is assessed with warmth, tenderness and swelling.
- Ask about established plaque or pustular psoriasis, previous flares, pregnancy, infection, hypocalcaemia, medicine exposure and abrupt withdrawal of systemic corticosteroid or other psoriasis treatment.
- Do not dismiss fever and neutrophilia as infection or psoriasis alone: culture plausible sites and blood in systemic illness while simultaneously treating physiological compromise.
- AGEP is the key medicine-related mimic, often appearing rapidly after a drug with superficial flexural pustules, eosinophilia and quicker resolution after withdrawal; overlap still needs biopsy and specialist review.
- Admit significant widespread disease for repeated temperature, haemodynamic, respiratory, urine, blood-count, renal, liver, albumin, calcium and inflammatory assessment.
- Supportive care includes a warm environment, gentle bland emollient, fluid and electrolyte correction, nutrition, thrombosis and pressure care, and prompt directed antimicrobial treatment when infection is suspected.
- Never use or withdraw systemic corticosteroid casually in psoriasis; withdrawal is a recognised precipitant and rescue treatment needs an experienced dermatology team.
- NICE TA1070 recommends intravenous spesolimab for defined moderate-to-severe adult flares under specific GPPGA, fresh-pustule and body-surface criteria, including a separate subsequent-flare rule.
- The current intravenous SmPC licenses flare treatment from age 12, but NICE funding is narrower; licence, appraisal, life-threatening-disease evidence limits and local specialist access must all be distinguished.
Key red flags
Hypotension, hypoxia, confusion, oliguria, rapidly spreading painful pustulation, hypothermia or high fever, severe oedema, tetany, mucosal involvement, pregnancy, childhood, frailty, neutropenia, suspected sepsis or respiratory symptoms requires critical-care-level reassessment and urgent specialist treatment.
Hypotension, hypoxia, confusion, oliguria, marked calcium disturbance, tetany, extensive erosion or rapidly escalating oxygen and fluid need indicates critical illness.
Investigation priorities
Quantify neutrophilic inflammation and identify eosinophilia, cytopenia or infection risk.
Management branches
Widespread pustulation is accompanied by systemic symptoms, rapid progression or diagnostic uncertainty.
- Assess ABCDE, core temperature, haemodynamics, oxygen need, mental state, pain, extent, mucosae and urine output and involve dermatology immediately.
- Obtain full blood count, renal, liver, albumin, calcium, magnesium, CRP and appropriate cultures, biopsy a fresh lesion and document the complete medicine timeline.
- Nurse warm, use gentle bland barrier care, correct fluid and electrolytes against serial findings, support nutrition and treat clinically suspected sepsis promptly.
- Avoid abrupt systemic corticosteroid withdrawal and escalate pregnancy, organ failure, respiratory deterioration or shock to the relevant acute and critical-care teams.