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This happens when the skin's sebaceous glands produce too much oil, or sebum, giving the skin a greasy look. Uneven Skin Tone with DarkSpots (PIH) & Redness (PIE) Post-inflammatory hyperpigmentation (PIH) refers to darkspots that form after a blemish heals.
Continuing the p rocess that started in your thirties , the skin produces less sebum, the oily waxy substance that moisturizes and protects those top layers on your face. Conventional retinol can cause dryness, redness and sensitivity and can cause a purging stage (essentially where your skin will get worse before it gets better).
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