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One of the biggest mistakes people make when using a collagen serum mask is applying it to an unprepared face. If your skin isn’t clean, the mask’s beneficial ingredients won’t penetrate as effectively. Dirt, oil, and leftover makeup can create a barrier that prevents absorption, making the treatment less effective. Read More: https://ideaexpress.us/5-common-mistakes-youre-making-when-using-a-collagen-serum-mask/