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 trouble breathing, fainting, or swelling of the tongue or throat.
These are not expected features of PMLE and may indicate a serious allergic reaction or another emergency.
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 prompt medical advice if:
The rash is very painful, widespread or heavily blistered
Your eyes, mouth or genitals are affected
You develop fever or feel generally unwell
The skin shows signs of infection
A new rash began after starting a medicine
You also have joint pain, marked fatigue or other unexplained symptoms
3
Does any of this apply?
Book an appointment
Arrange a routine appointment if you have a recurring rash after sunlight and have not previously had it assessed.
Review is also appropriate if the rash is getting more severe, lasts despite avoiding further UV exposure, interferes with daily life or may be related to a medicine.
Every sign above is quoted from the sofidex article on Polymorphous light eruption. If you are not sure, err upward — it is always reasonable to be checked.