Key Summary: There isn't just one cause for inner skin dryness. The approach needed differs depending on whether the barrier is compromised or if only moisture is lacking. Rejuran, water-glow treatments, and post-procedure care each address different aspects.
When your skin is oily on the surface but feels dry underneath
When you stay in a room with the air conditioner on for a long time, the humidity in the air drops, and the moisture in your skin evaporates more quickly. To compensate for the lack of moisture, your body then produces more oil. This is how the state of being oily on the surface but dry underneath is created.
If this state persists, the protective barrier on your skin's surface thins, and even minor irritations that would normally be overlooked can cause breakouts. This is often the point where people feel that cosmetics alone aren't enough and start looking into procedures.
However, even with the same feeling of dryness, the causes can vary. The area that needs to be addressed differs depending on whether the protective barrier itself is compromised or if the barrier is intact but simply lacks sufficient moisture.
Breaking it down into three approaches
The first approach is to change the environment. Rejuran's goal is not just to replenish water, but to create skin that loses less water. It is suitable for cases where dryness frequently returns, or when the skin is thin, sensitive, and prone to frequent troubles.
The second approach is to replenish. Water-glow or skin booster treatments directly deliver much-needed moisture to the deeper layers. Consider this when you want to quickly alleviate the immediate feeling of dullness and dryness.
The third approach is to protect. Even if treatments replenish moisture, the results won't last long if post-procedure care is neglected. The process of calming and protecting the sensitized surface must follow for the results to settle in. Care that supplies high-concentration oxygen and negative ions in a non-contact manner, along with LED light, falls into this category.
How to choose
Rather than choosing one out of three, it's more about first determining which category your skin currently falls into. If the barrier is the problem and you only replenish water, you'll return to the same state in no time. Conversely, if only water is lacking and you start by addressing the barrier, you might feel the effects more slowly.
Even if symptoms appear similar, the order of treatment changes if the starting point is different. This is why the process of first understanding your condition and setting a direction should precede the choice of procedure.
What you can do at home
It doesn't end with just procedures. Even remembering just three things can make a difference.
If you spray mist and leave it, your skin may actually become drier. This is because as it evaporates, it takes away existing moisture. Always cover your skin after spraying.
Simply redirecting the air conditioner's airflow so it doesn't directly hit your face or moving your seat can make a difference. The areas exposed to the wind dry out much faster.
Drinking water is fundamental but often overlooked. If your body is dehydrated, the skin won't get its turn for hydration.
Frequently Asked Questions
Does the procedure hurt a lot?
You may experience temporary swelling, redness, and pain, and the degree varies from person to person. It's best to discuss the expected reactions during your consultation beforehand.
Which comes first, Rejuran or water-glow?
It depends on which category your skin currently falls into. If the barrier is weakened, it's faster to address the environment first. If only the moisture content is lacking, replenishing it is quicker.
Is one session enough?
It depends on your condition and goals. Since the interval and number of sessions are adjusted based on your skin's response, it's difficult to determine a specific number from the start.
Is post-procedure care essential?
For the replenished moisture to settle in, the surface needs to be stable. Skipping post-procedure care may result in shorter-lasting effects.
Visit and Consultation Information
O.N Clinic is conveniently located near Gangnam Station, making it easy to access by subway.
It is more accurate to determine whether the problem is with the barrier or the moisture content after directly examining your skin. For any questions, you can easily inquire via Chat for a consultation now.
Author: Dr. Oh Seung-min (Chief Director of O.N Clinic, graduated from Seoul National University College of Medicine, Academic Committee Chairman of the Korean Society for Laser Dermatology and Hair). Detailed credentials can be found in Medical Staff Introduction. First published 2026-08-31 / Last reviewed 2026-09-02
This article is for general informational purposes only, and appropriate treatment and results may vary depending on individual conditions.
