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.
1
Apply a small amount of the product. Keep the area dry for 24 hours.
2
After 24 hours rinse the area.
3
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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