When you sweat and then wash your face—especially daily, sometimes more than once—you’re not just removing dirt. You’re removing the natural lipids your skin depends on to stay balanced.
That repeated cycle slowly changes how your skin behaves.
This is where transepidermal water loss, or TEWL, comes in. It’s the process where water escapes from your skin faster than your body can replace it. Normally, your skin handles this without you noticing.
But when your barrier is disrupted again and again, that balance starts to break down.
And when it does, your skin doesn’t just feel dry. It starts losing control.