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 someone:
Routine follow-up is reasonable if mild digestive, skin, or breathing symptoms are not settling as expected, even when no emergency signs are present.
And for anyone, someone who:
Get urgent medical or poison-service advice if there is repeated vomiting, increasing abdominal pain, abdominal swelling, inability to pass stool or gas, persistent coughing, wheezing, chest pain, or shortness of breath.
Urgent advice is also appropriate after swallowing a large or unknown amount, or when the product contains lamp oil, kerosene, solvents, concentrated essential oils, or unidentified ingredients.
Eye pain, blurred vision, continuing redness, or wax stuck in the eye needs prompt assessment.
A deep, blistered, infected, or slow-healing burn should also be examined.
The article also says
A small swallow of plain candle or crayon wax without symptoms can often be managed with poison-service advice and observation at home.
In the United States, Poison Control is available at 1-800-222-1222 or through webPOISONCONTROL.
Elsewhere, use your local poison information service.[2]
Every sign above is quoted from the sofidex article on Wax poisoning. If you are not sure, err upward — it is always reasonable to be checked.