[Acne] [Skin Concerns] What are these shiny, red patches on my face?

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https://imgur.com/a/i0HSOThese shiny, flaky patches appeared on my face yesterday I believe. For about 3-4 days, they were pimples. I did not pop them; I just let my acne treatments do their work. What causes this shininess and how can I treat/prevent it?
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