Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call emergency services now if the exposed person has:
Routine follow-up is appropriate for symptoms that persist but are stable; sudden breathing difficulty is an emergency.
And for anyone, someone who:
Contact a poison information service promptly after kerosene is swallowed, even if there are no symptoms.
They can advise whether observation at home or assessment in a healthcare setting is appropriate.
Have the product container available if it can be handled safely.
Do not wait for symptoms to improve on their own when breathing or consciousness is affected.
Seek prompt medical advice after an eye splash if pain, redness, light sensitivity, or blurred vision continues after rinsing.
Skin irritation that persists after washing can usually be assessed through routine care.
The article also says
After an initial medical assessment, seek further help if breathing becomes more difficult, a cough worsens, or new fever and weakness develop.
Every sign above is quoted from the sofidex article on Kerosene poisoning. If you are not sure, err upward — it is always reasonable to be checked.