Patch Test Guide for The Ordinary Lactic Acid 5% + HA
How to Patch Test The Ordinary Lactic Acid 5% + HA
Clean skin on the upper forearm area.
Apply a small amount of the product. Keep the area dry for 24 hours.
After 24 hours rinse the area.
If any redness, burning. itching, blistering or irritation is observed at any time throughout the test, do not use the product.
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