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
Emergency care is appropriate if a rash occurs with difficulty breathing, swelling of the face or tongue, fainting, widespread blistering, or peeling involving the mouth or eyes.
Those symptoms suggest a different and potentially serious reaction.
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 assessment for rapidly increasing redness, warmth, swelling, pus, worsening pain, or fever.
These are not typical features of granuloma annulare and could suggest an infection or another condition.
3
Does any of this apply?
Book an appointment
Arrange a routine appointment if you develop an unexplained ring-shaped rash.
Several conditions can look similar, and ringworm requires different treatment.
You should also seek routine medical advice if:
The bumps are widespread, itchy, painful, or affecting daily life
The areas have not improved or continue to multiply
A previously diagnosed area develops a different appearance
Treatment causes skin thinning, sores, marked colour change, or other concerns
You develop unexplained firm lumps under the skin
The article also says
Granuloma annulare itself is not an emergency.
Every sign above is quoted from the sofidex article on Granuloma annulare. If you are not sure, err upward — it is always reasonable to be checked.