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
Sudden collapse, breathing difficulty, or other unrelated severe symptoms should be handled as emergencies in the usual way rather than attributed to a skin tag.
And for anyone, someone who:
is bleeding heavily and it will not stop with firm pressure
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 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
Make a prompt appointment if a presumed skin tag:
Grows quickly or changes noticeably
Has an irregular shape or several colours
Becomes persistently painful
Develops an open sore
Bleeds repeatedly without being caught or cut
Feels firm or has a broad base rather than a soft stalk
Get urgent medical help if bleeding continues despite firm, steady pressure with clean gauze or cloth.
Urgent assessment is also appropriate for spreading redness, worsening swelling, pus, fever, or severe pain after injury or attempted removal.
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 a skin growth is new and its identity is uncertain, or if it is causing repeated irritation.
Assessment is also appropriate if removal is wanted because it catches on clothing, affects vision, or causes distress.
And for anyone, someone who:
has noticed a lump, a mole that has changed, or unexplained weight loss
The article also says
A skin tag is not usually an emergency.
Every sign above is quoted from the sofidex article on Cutaneous skin tag. If you are not sure, err upward — it is always reasonable to be checked.