Patch Testing Guide.

Patch tests are an easy way to help predict if you will have a negative initial reaction to a new product. It is recommended to perform a patch test before incorporating a new product into your routine. We have outlined a general method for conducting your own patch test based on the type of product.

The Ordinary Salicylic 2% Solution & Masque

Patch testing prior to use is advised: Apply the product as directed to a small area once a day for three days to test if you are sensitive to this product. If you develop severe irritation, hives, swelling of eyes and mouth, blistering, or difficulty breathing, rinse off, cease use and consult a physician right away.

Leave-on and rinse-off products

• 01.

  Apply a small amount of the product onto a clean area of skin on the upper forearm.

• 02.

  Keep the area dry.

• 03.

  After 24 hours rinse the area.

• 04.

  If any redness, burning, itching, blistering or irritation is observed at any time throughout the test, do not use the product.

Masks and peeling solutions

(The Ordinary AHA 30% + BHA 2% Peeling Solution, NIOD Mastic Must, NIOD Myrrh Clay, NIOD Flavanone Mud, etc.)

• 01.

  Apply a small amount of the product onto a clean area of skin on the upper forearm.

• 02.

  Leave-on for the specified length of time stated in the directions of use of the product.

• 03.

  Rinse off when the specified time has passed.

• 04.

  If any redness, burning, itching, blistering or irritation is observed within 24 hours of the patch test, do not use the product.

Please note that the patch test is only for determining initial irritation reactions to products and does not guarantee similar results when applied to other areas of the body (including the face) or after continuous use. It does not account for underlying conditions and should not be used for the diagnosis of hypersensitivity or allergic contact dermatitis. If you are concerned about starting a new product, please consult a dermatologist prior to use.