Speed Dial is a weekly series of quick tips, simple breakdowns and key concepts you can grasp over breakfast. Learn something new about skincare in as little as 100 and no more than 400 words. Previous Issue: How to Wash Your Face
The epidermis is the outer layer of skin. It’s composed of 4 or 5 layers (stratum) and has 5 main types of skin cells. The ou…
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