Why did my acne treatment turn my face red and warm?

Every time i use my acne treatment, my skin is always dry, red, and warm. So i put on the toner and lotion, and that seems to help the dryness. However, it still remains blotchy red around the bridge of my face, and kind of warm. The treatment, toner, etc. works for my acne extremely well, compared to anything else i've used in the past. Even later in the day, my skin is still red. Why is this happening? It never happened before, just when I wash it. D:

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