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 if flushing occurs with:
Trouble breathing, wheezing, or throat tightness
Swelling of the tongue, lips, mouth, or throat
Fainting, severe dizziness, confusion, or blue-grey lips
Sudden chest pain, one-sided weakness, or a severe unusual headache
These symptoms may indicate a serious allergic reaction or another emergency.
If you have been prescribed an adrenaline auto-injector for severe allergies, use it as directed and call emergency services.
And for anyone, someone who:
has lips or skin that look pale, blue, grey or blotchy
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 you believe has taken an overdose or swallowed something poisonous
2
Is any of this happening?
Be seen today
Seek same-day medical advice if new flushing occurs with fever, repeated vomiting or diarrhoea, a very fast heartbeat, or feeling seriously unwell.
Painful, rapidly spreading redness with fever also needs prompt assessment because it may be a skin infection rather than simple flushing.
And for anyone, someone who:
has a wound that is hot, spreading red, or leaking pus
3
Does any of this apply?
Book an appointment
Arrange a routine appointment if the episodes:
Keep returning without a clear trigger
Last longer or become more intense
Began after starting or changing a medicine
Come with ongoing diarrhoea, wheezing, headaches, or racing heartbeats
Cause persistent facial redness, eye irritation, or skin changes
Affect your confidence, sleep, work, or social life
And for anyone, someone who:
has noticed a lump, a mole that has changed, or unexplained weight loss
Every sign above is quoted from the sofidex article on Skin blushing/flushing. If you are not sure, err upward — it is always reasonable to be checked.