Serums & Essences · 16/06/2026
The hydration myth that keeps oily skin trapped in a frustrating cycle
Skipping hydrating actives because skin is oily is one of the most common, most counterproductive habits in skincare — dehydrated oily skin often overproduces sebum specifically because it's starved of water, not because it has too much oil to begin with.
Why "oily" and "dehydrated" are not opposites, despite how they sound
Oil production (sebum) and water content (hydration) are two separate, independent skin properties — it's entirely possible, and actually common, for skin to be simultaneously oily and dehydrated. When dehydrated skin senses a water deficit, it can respond by increasing sebum production as a compensatory protective measure, meaning the oiliness some people experience is partly a downstream symptom of insufficient hydration, not purely excess oil production on its own.
Why avoiding hydrating actives on oily skin can make the underlying problem worse
Skipping moisturising and hydrating steps specifically because skin feels oily — a very common instinct — can perpetuate the dehydration that's partly driving the excess oil production in the first place, creating a frustrating cycle where the skin gets oilier the more it's deprived of water-based hydration, rather than the relief that avoiding "heavy" products was supposed to provide.
Using a lightweight, multi-molecular-weight hyaluronic formula specifically suited to oily skin
A triple hyaluronic acid ampoule, using multiple molecular weights of HA to hydrate at different skin depths, delivers genuine water-based hydration in a lightweight, oil-free texture that won't add to surface shine the way a heavier cream might. Apply as a serum step both morning and evening, and observe over several weeks whether overall oiliness actually decreases as hydration improves — counterintuitive, but a commonly reported outcome of correctly addressing the dehydration component.
COSRX Hydrium Triple Hyaluronic Moisture Ampoule 40ml — available on BuyBeautyKorea →
