All cosmetic ingredients have the potential to irritate sensitive skin regardless of the amount present in an individual product or the method in which it is used.  Irritations can sometimes occur in the regular course of our daily lives, even where we have used and enjoyed a product successfully for many years. The trigger for a reaction can be an unexpected one and may not necessarily repeat itself in the same way. We ask that you consider any changes to your regular routine that may have triggered the reaction (dietary, contact with possible allergens such as household cleaning liquids etc.).  Where one experiences an adverse reaction to any cosmetic preparation, the best course of action is to discontinue use and if necessary, consult your medical practitioner to establish whether you have experienced an irritation or an allergy.  In the unlikely event that you experience an adverse reaction to an Aesop product, please discontinue use and return it to the place of purchase or Contact Us.