[Product Question] patch testing azelaic acid and timing of adding it to routine

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sleepycatbeans is in Product Question

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I just got into skin care. I have a cleanser, moisturizer and sunscreen. Now I want to add Paula’s Choice Azelaic Acid so tonight I did a patch test on my face. I’ve read here that you should introduce actives very slowly. So if I did the patch test tonight should I wait a whole week before I put it on my whole face? Is one night of patch testing enough to check for adverse reactions? If not then how soon should I do another patch test and should it be the same spot or a different spot?

Thanks everyone!

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Posted: 4 years ago
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