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
Call emergency services for symptoms suggesting anaphylaxis, including:
Trouble breathing, wheezing, or a tight throat
Swelling of the tongue or throat
Fainting, collapse, confusion, or severe weakness
A rapidly worsening reaction affecting several body systems
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
Use an adrenaline auto-injector immediately if one has been prescribed for this situation.
Do not wait to see whether a severe reaction settles.
Seek prompt medical advice for repeated near-fainting, severe abdominal symptoms, widespread swelling, or blistered skin that appears infected.
Signs of infection can include increasing pain, warmth, pus, or fever.
3
Does any of this apply?
Book an appointment
Arrange routine medical follow-up if new persistent spots develop, existing areas change substantially, or itching and flushing are affecting sleep or daily life.
Adults with newly appearing spots should be assessed for possible systemic involvement.
You should also discuss upcoming surgery, anaesthesia, or a history of reactions to medicines or insect stings during routine care.
Every sign above is quoted from the sofidex article on Urticaria pigmentosa. If you are not sure, err upward — it is always reasonable to be checked.