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10-05-2013 09:00 AM
I recently started a Retin-A routine and use it every night. Most nights, I wash my face just before bed, towel pat dry, and then immediately apply the Retin-A.
I have no irritation from this routine. But I worry if it's reducing the effectiveness of the product. I forgot to ask the Derm about this at my last visit.
Does anyone definitively know why we need to wait 20 minutes after cleaning before applying the product?
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