Products may contain certain ingredients which may cause allergy especially if you have any history of allergies by the use of such ingredients.
If you have any allergies, you are required to read the product ingredients on the label or website carefully. You are also required to carry out a patch test as instructed on each product, and if you face any irritation/ reaction, you must immediately discontinue its use.
If you are not aware of any allergy, you must do a patch test before its use.