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
Go to an emergency department after an injury if a finger or toe becomes pale, blue, cold, very numb, or difficult to move.
Severe bleeding, rapidly increasing swelling, or intense pain also needs emergency assessment because blood flow or deeper tissues may be affected.
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 same-day medical care if the area becomes painful, warm, swollen, or increasingly red, or if there is pus, an open wound, red streaking, or fever.
These signs may indicate infection or significant inflammation.
3
Does any of this apply?
Book an appointment
Mention it during routine care, particularly for a baby or child.
An assessment can show whether only skin is involved and whether growth or movement may be affected.
Book an appointment if the webbing:
Limits finger, toe, hand, or foot movement
Causes rubbing, sores, hygiene problems, or trouble with footwear
Appears to be tightening as a child grows
Develops after an injury, burn, operation, or skin disorder
Is new or changing without a clear explanation
The article also says
Webbing present since birth is not usually an emergency.
Every sign above is quoted from the sofidex article on Webbing of the fingers or toes. If you are not sure, err upward — it is always reasonable to be checked.