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How to do a Patch Test

By Watsons Singapore

https://www.watsons.com.sg/blog/skincare-tips/how-to-patch-test-a-new-skincare-product

Even though the above article states different areas of body to do a patch test, we recommend the elbow as an area for the patch test. 

"As with any product, discontinue use immediately if you experience any adverse reaction. These products are for external use only.
No medical claims are made or implied. The information is not intended to be used to treat or diagnose any condition.
If you have medical concerns or questions please consult your physician."