Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
1
Is any of this happening now?
Call 911
Go to an emergency department or call emergency services if a widespread rash is accompanied by:
Fever, shaking chills or severe weakness
Trouble breathing, chest pain or a very fast heartbeat
Confusion, fainting or difficulty staying awake
Very little urine, severe dizziness or inability to drink
Rapidly worsening pain, swelling or skin peeling
Other emergency signs, for anyone
Someone who is struggling to breathe, gasping, choking, or cannot get words out
Someone who has chest pain, tightness or pressure lasting more than a few minutes
Someone who has sudden weakness or drooping on one side of the face or body, slurred speech, or sudden confusion
Someone who is unconscious, or cannot be woken
Someone who is bleeding heavily and it will not stop with firm pressure
Someone who has had a seizure that will not stop, or does not wake up afterwards
Someone who has lips or skin that look pale, blue, grey or blotchy
Someone who you believe has taken an overdose or swallowed something poisonous
2
Is any of this happening?
Be seen today
Seek urgent same-day medical care if you develop a new or rapidly spreading pustular rash, particularly if you have had GPP before.
You should also seek urgent advice if symptoms return after a medicine has been started, stopped or changed.
A widespread pustular rash during pregnancy also needs urgent assessment.
3
Does any of this apply?
Book an appointment
Routine follow-up is appropriate when your condition is stable but flares are becoming more frequent, treatment is not controlling symptoms, or side effects are affecting you.
New joint pain, persistent tiredness or changes in your nails or usual plaque psoriasis should also be discussed at follow-up.
Every sign above is quoted from the sofidex article on Zambusch's disease. If you are not sure, err upward — it is always reasonable to be checked.