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 immediately if the exposed person:
Do not delay emergency help while trying home treatments.
And for anyone, someone who:
Contact a poison centre promptly after substantial inhalation, when the amount or ingredients are unknown, or when a baby or young child was exposed.
Seek urgent medical assessment for persistent coughing, wheezing, rapid breathing, chest pain, repeated vomiting, unusual sleepiness, or any worsening symptom.
Seek urgent assessment if pain, redness, light sensitivity, or blurred vision remains.
Arrange routine follow-up for improving symptoms that have not cleared, such as a lingering cough or reduced exercise tolerance.
Bring the product information if available.
The article also says
Move the person away from airborne powder if it is safe.
After eye exposure, rinse thoroughly.
Every sign above is quoted from the sofidex article on Face powder poisoning. If you are not sure, err upward — it is always reasonable to be checked.