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Direct Answer
Over-cleansing strips the natural lipids that hold your skin barrier together, the same lipids that keep moisture in and irritants out. Once they’re gone, water escapes faster than your skin can replace it, and the compensatory response is often more oil, not less, which is why over-cleansed skin can look both dry and oily at once.
Cleansing feels like the safest step in any routine. It’s hard to imagine that washing your face could be the thing working against you. But over-cleansing, especially with harsh cleansers or hot water, is one of the most common and most overlooked causes of a damaged barrier.
The brick wall your cleanser is tearing down
Dermatologists often describe the skin barrier as a brick wall. The bricks are dead skin cells called corneocytes. The mortar holding them together is a mix of lipids: ceramides, fatty acids, and cholesterol. That mortar is what keeps the wall intact, holding moisture in and keeping everything else out.
Cleansers are designed to dissolve oil, which is exactly the problem. A cleanser can’t tell the difference between the dirt and excess sebum you want gone and the protective lipids you need to keep. Wash too often, or with something too harsh, and you strip both.
Why stripped skin often gets oilier, not drier
This is the part that trips people up. When cleansing strips your natural oils, sebaceous glands often read that loss as a signal to produce more, not less. So the same over-cleansing that’s meant to control oil can end up increasing it, while the skin underneath is actually dehydrated. That combination, oily on the surface and dry underneath, is one of the clearer signs the cleansing itself is the problem.
What this actually costs your skin
Once the barrier is compromised, trans-epidermal water loss increases, meaning water evaporates from your skin faster than your body can replace it. Research on repeated washing has shown the damage compounds with each additional cleanse in a short period, which is why occupations involving frequent hand-washing are a well-documented real-world example of this exact mechanism. Most routines don’t come close to that extreme, but the same principle applies at a smaller scale: more cleansing isn’t automatically better, and past a certain point it actively works against you. (For more detail, see the American Academy of Dermatology’s guide to repairing a damaged skin barrier.)
What actually helps
This isn’t an argument for skipping cleansing. It’s an argument for being deliberate about it: a gentler, non-stripping cleanser, lukewarm water instead of hot, and honestly asking whether you need to cleanse twice a day or whether an evening cleanse and a morning rinse would leave your skin better off. Small changes here often do more than any product added on top.
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