Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
And for anyone, someone who:
Seek urgent reassessment if pain is increasing, vomiting continues, breathing becomes difficult, urine output falls, hearing changes, or eye symptoms do not settle after rinsing.
New trouble swallowing, painful swallowing, coughing during meals, or a feeling that food is sticking should also be assessed promptly.
Follow the poison center's or treating clinician's instructions about observation and follow-up.
A person managed at home should not be left alone if new symptoms could interfere with their ability to seek help.
After hospital treatment, follow-up may include checks of kidney function, hearing, vision, breathing, or swallowing.
The type and timing depend on the ingredient and the injuries found during the initial assessment.
Routine follow-up is appropriate for a mild skin rash, lingering irritation, or concerns about safe product use when symptoms are stable and improving.
People with repeated workplace exposure can discuss ventilation, gloves, eye protection, and safer handling practices with an occupational health professional.
The article also says
Store permanent-wave products in their original containers, tightly closed and away from children.
Keep them separate from food, drinks, medicines, and household cleaners.
Discard products according to the label and local waste rules.
Every sign above is quoted from the sofidex article on Cold wave lotion poisoning. If you are not sure, err upward — it is always reasonable to be checked.