But my middle school self and current day me still have one very important skincare staple in common: tretinoin. You've probably seen the popular skincare ingredient bouncing around the Internet ...

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And while there are plenty of mild, over-the-counter retinol products on the market, if you’re wondering how to get tretinoin ...

She says, "You should not be applying tretinoin like this directly on your scalp," adding what harmful effects this may have, "It is only going to give you more irritation or post-inflammatory ...