Thank you for the question.
You may have developed a contact dermatitis to the application of the brigthening essence. This may be due to irritation or allergy to the essence.
It is important to stop using the product to prevent further aggravation of the rash. Use a gentle cleanser to wash the face and moisturize the face with a gentle moisturizer. Avoid using harsh products on the skin as this may further worsen the rash.
If the rash is very bad, you may wish to see your doctor or dermatologist for further assessment. Topical steroid creams may be needed to calm the skin redness and inflammation.
You can also consider doing a patch test which can help to identify if there are any allergens or substances that you may be allergic to so that you can avoid subsequent contact with these substances.