Introduction
In the age of viral beauty trends and DIY skincare hacks, “slugging” has emerged as a hot topic in the skincare community. The term, originally popularized by Korean beauty routines and amplified by TikTok influencers, refers to coating the face with an occlusive agent like petroleum jelly as the final step in a nighttime skincare routine. The goal? To lock in moisture, repair the skin barrier, and wake up with a dewy, hydrated complexion. While the concept seems simple, it’s sparked a debate among dermatologists, skincare experts, and users alike. Is slugging a legitimate, science-backed skincare technique — or just another fleeting trend powered by social media algorithms? This article explores the technique in detail, weighing the pros and cons, evaluating scientific backing, and offering practical advice to determine if slugging is truly a skincare game-changer or just hype wrapped in gloss.
1. Understanding Slugging: The Basics
Slugging is a skincare technique that involves applying an occlusive agent—most commonly petroleum jelly—over the entire face as the final step of a nighttime skincare routine. The term “slugging” originates from the glossy, slime-like appearance the face takes on after application, reminiscent of a slug’s trail. Despite its quirky name, the practice has roots in traditional skincare approaches, particularly in Korean beauty routines. The primary function of slugging is to seal in all previously applied skincare products, such as serums and moisturizers, to prevent water loss during sleep. It doesn’t hydrate the skin on its own but acts as a barrier to maintain the hydration already provided. Slugging is most effective for people with dry, sensitive, or compromised skin barriers, especially during colder months or in arid climates. However, it’s important to remember that slugging doesn’t replace your existing skincare—it enhances it by locking in moisture and strengthening the skin’s protective functions overnight.
2. The Science Behind Slugging
The science behind slugging lies in its ability to reduce transepidermal water loss (TEWL), a natural process where moisture evaporates from the skin’s surface. The skin’s outer layer, the stratum corneum, acts as a protective barrier, but environmental factors, over-exfoliation, and certain skin conditions can weaken this layer. Occlusive ingredients like petrolatum create a physical shield over the skin, preventing water from escaping and allowing the skin to retain hydration longer. Dermatological research has shown that petrolatum can reduce TEWL by more than 90%, making it one of the most effective occlusives available. Furthermore, during sleep, the skin undergoes its natural repair cycle, and slugging enhances this process by creating a moist environment conducive to healing. This occlusion also amplifies the effects of hydrating products applied beforehand, ensuring they stay active and penetrate more effectively. From a scientific perspective, slugging is less a gimmick and more a reinforcement of basic dermatologic principles.
3. Benefits of Slugging
Slugging offers numerous benefits, particularly for those struggling with dry, flaky, or irritated skin. One of the most immediate and noticeable effects is enhanced skin hydration. By sealing in moisture, slugging leaves the skin feeling soft, smooth, and plump by morning. This method is especially beneficial in winter or in dry climates where environmental factors strip the skin of moisture. In addition to hydration, slugging can help heal a compromised skin barrier, making it ideal for people dealing with sensitivity, post-procedure recovery, or conditions like eczema. It also protects the skin from irritants and pollutants while enhancing the performance of underlying skincare products by preventing them from evaporating or rubbing off during sleep. For some, consistent slugging has led to a reduction in redness, fewer dry patches, and a more even, radiant complexion. While results vary by skin type, the core benefit remains: slugging supports a healthy, functioning skin barrier by locking in moisture and minimizing damage.
4. Potential Drawbacks and Risks
While slugging can be transformative for many, it’s not without potential risks—especially for those with oily or acne-prone skin. One major concern is that occlusives, particularly petroleum jelly, can trap not just moisture but also sebum, bacteria, and dead skin cells beneath the surface, creating an environment conducive to breakouts and clogged pores. This is why dermatologists often caution acne-prone individuals to approach slugging carefully or avoid it altogether unless using non-comedogenic occlusives. Additionally, applying an occlusive over potent actives like retinoids, acids, or benzoyl peroxide can intensify their absorption, potentially leading to irritation, peeling, or inflammation. Another drawback is discomfort—slugging can feel sticky or heavy, which some users find unpleasant, especially in hot or humid environments. Overuse of slugging without allowing the skin to breathe or exfoliate properly may also dull the complexion. Therefore, slugging should be done sparingly and mindfully, considering skin type, current skin health, and the climate.
5. How to Slug Properly
To reap the full benefits of slugging without experiencing its drawbacks, it’s important to follow the correct method. The process starts with thoroughly cleansing your face to remove makeup, sunscreen, and dirt. This ensures that no impurities are trapped under the occlusive. After cleansing, apply your usual hydrating serums and moisturizers—products with humectants like hyaluronic acid and glycerin work especially well, as they draw water into the skin. Once your skincare has absorbed, gently apply a thin but visible layer of an occlusive like petroleum jelly (Vaseline, Aquaphor, or a similar non-comedogenic balm) over the entire face. The slugging step should always come last, and it’s best done at night to allow the skin to repair while you sleep. Avoid slugging over exfoliants or active treatments such as retinoids or acids unless you have experience layering them correctly, as occlusion can increase their penetration and lead to irritation. You don’t need to slug every night—1 to 3 times a week is sufficient for most people. By following these steps, slugging can become a safe and effective way to lock in moisture and support skin recovery.
6. Slugging for Different Skin Types
While slugging can benefit many, its impact varies depending on your skin type. For dry and sensitive skin, slugging is often transformative. The added layer of protection helps prevent flaking and calms irritation by shielding the skin from moisture loss. People with eczema or rosacea may also find relief, as occlusives provide a barrier that allows the skin to heal without interference. For those with oily or acne-prone skin, caution is necessary. Occlusive ingredients can trap oil and bacteria, increasing the risk of breakouts or blackheads. In such cases, a lighter occlusive or slugging only on dry areas (like around the eyes or mouth) may be more appropriate. Combination skin types can selectively apply the occlusive to drier patches while skipping oilier zones like the T-zone. Meanwhile, mature skin may benefit from the increased hydration and protection slugging offers, especially if combined with barrier-repair products. Understanding your skin’s unique needs and adjusting your approach accordingly ensures you get the most from this technique without exacerbating existing issues.
7. Common Myths About Slugging
As with many viral skincare trends, slugging is surrounded by several myths that can mislead users. One common misconception is that slugging itself hydrates the skin. In reality, petroleum jelly and other occlusives do not add moisture; they simply seal in the hydration provided by earlier products. Another myth is that slugging can replace moisturizers entirely—this is false. Without a water-based moisturizer or humectant underneath, slugging won’t offer any real hydration benefits. Some believe slugging is only for dry skin, but it can be adapted for other skin types if done selectively. There’s also the idea that slugging delivers instant, overnight results; while some improvement may be noticeable, long-term consistency is key to seeing significant skin barrier repair. Finally, it’s often claimed that slugging is a new skincare discovery, but dermatologists have used occlusive therapy for decades to treat wounds, dryness, and sensitivity. Debunking these myths helps users approach slugging realistically and incorporate it safely into their routine.
8. Comparing Slugging to Other Hydration Methods
Slugging isn’t the only method for improving skin hydration, and it’s useful to compare it with other techniques. For example, layering moisturizers—using multiple hydrating products from lightest to heaviest—is a popular K-beauty method that emphasizes gradual hydration. While effective, it doesn’t always prevent water loss as efficiently as slugging. Overnight masks, often infused with humectants, emollients, and soothing ingredients, offer a more cosmetically elegant feel and are generally lighter than petroleum-based products. However, their occlusive ability may not match that of petrolatum, especially for severely dry skin. Facial oils provide emollient benefits and some occlusion, but they lack the full sealing capacity of pure petrolatum. Ultimately, slugging is unique because it creates a near-impermeable layer that maximizes moisture retention, while other methods focus more on adding hydration rather than preserving it. Choosing the right approach depends on skin needs, comfort level, and environmental factors—but slugging can complement other techniques when used strategically.
9. Slugging in Different Climates and Seasons
Slugging’s effectiveness and comfort can vary greatly depending on the climate and time of year. In cold or dry climates, especially during winter, slugging can be a skin-saver. The lack of humidity, harsh winds, and indoor heating systems often lead to increased transepidermal water loss (TEWL), which causes dry, irritated skin. Slugging acts as a protective barrier, locking in moisture and shielding the skin from environmental aggressors. In contrast, in hot and humid environments, slugging may feel heavy or suffocating on the skin and could increase the risk of clogged pores and breakouts—especially for those with oily or acne-prone skin. In such cases, lighter occlusives or spot-slugging on dry areas may be more appropriate. Seasonally adjusting your slugging frequency—more in winter, less in summer—can help maintain balance. Ultimately, slugging is most beneficial in harsh or dry weather conditions where skin is more vulnerable to dehydration and barrier damage.
10. Personalizing Your Slugging Routine
The key to successful slugging lies in personalization. Since everyone’s skin is different, tailoring your slugging routine based on your unique skin type, lifestyle, and environment is essential. For example, individuals with very dry or compromised skin may benefit from slugging several times a week, whereas those with combination or acne-prone skin may prefer to slug only once a week or focus on drier areas like the cheeks and around the eyes. Your routine should also account for the products used underneath the occlusive layer—stick to hydrating, non-irritating formulas and avoid applying actives like AHAs, BHAs, or retinoids just before slugging unless you are certain your skin can tolerate the combination. Additionally, consider your sleep environment; if you sleep on your stomach or side, slugging may transfer to pillowcases, so opt for a silk pillow or place a towel over your pillow. By fine-tuning when, where, and how you slug, you’ll achieve better results with fewer side effects.
11. Expert Opinions and Dermatologist Recommendations
Dermatologists are generally in agreement about slugging’s benefits—particularly its ability to support the skin barrier and prevent moisture loss—but they caution that it’s not a one-size-fits-all solution. Experts highlight that petrolatum is one of the most effective occlusives available, and it’s widely used in clinical dermatology to treat wounds, eczema, and post-procedure healing. That said, most dermatologists advise against slugging over active ingredients, as it can increase their potency and lead to irritation. They also point out that acne-prone or oily skin types should proceed carefully, using non-comedogenic occlusives or avoiding the practice entirely. Many recommend patch testing before applying products like Vaseline all over the face. According to dermatologists, slugging is most beneficial as a targeted treatment, rather than a nightly habit, and it’s especially effective when combined with proper moisturization and gentle skincare practices. Their overall message is clear: when done correctly and sparingly, slugging can be a powerful, skin-repairing tool.
12. The Cultural and Social Media Influence
Slugging’s rise to fame has been largely driven by social media platforms, particularly TikTok, YouTube, and Instagram, where influencers share before-and-after transformations, often showcasing plump, glowing skin after a single night of slugging. What began as a quiet practice in Korean beauty routines quickly went viral, amassing millions of views under hashtags like #slugging and #sluglife. While the trend has brought increased awareness to barrier repair and skin hydration, it has also led to oversimplification and misinformation. Many users adopt slugging without understanding their skin type or layering products safely, which sometimes results in irritation or breakouts. Additionally, the visual appeal of thick, shiny skin has made slugging seem more like a skincare miracle than a technique rooted in dermatologic science. While social media has helped democratize skincare knowledge, it’s important to approach these trends with a critical eye, verifying advice with scientific sources or dermatological guidance. Slugging may be effective, but it’s not a magic fix—and it’s not for everyone.
13. FAQs About Slugging
Q1: Can I slug every night?
For most skin types, slugging every night isn’t necessary and may even be counterproductive. If your skin is extremely dry or recovering from irritation, you may benefit from nightly slugging temporarily. Otherwise, 1–3 times per week is typically sufficient to support hydration and barrier repair without risking clogged pores or over-moisturization.
Q2: Should I slug over active ingredients like retinol or acids?
It’s best to avoid slugging over strong actives unless advised by a dermatologist. Occlusion can increase the absorption and potency of these ingredients, which may cause irritation or sensitivity. If you’re using retinoids or exfoliants, try slugging on alternate nights or apply only to areas not treated with actives.
Q3: Is Vaseline the only product I can use for slugging?
Vaseline (petrolatum) is the most effective and affordable occlusive, but it’s not the only option. You can also use products like Aquaphor, CeraVe Healing Ointment, or natural alternatives with beeswax or lanolin. Just make sure they are non-comedogenic and free of fragrances and essential oils that might irritate sensitive skin.
Q4: Can I wear makeup after slugging?
Slugging is best done at night. Applying makeup over a thick occlusive layer is not practical and can lead to pilling or an oily appearance. If you need hydration during the day, opt for a lightweight moisturizer or hydrating primer instead.
Q5: Is slugging safe for acne-prone skin?
Slugging can be risky for oily or acne-prone skin if the occlusive traps sebum and bacteria. However, some non-comedogenic occlusives may work if applied selectively to dry areas. Always patch test first and monitor how your skin reacts before incorporating slugging into your routine regularly.
Conclusion:
Slugging has carved out a permanent place in the skincare conversation—thanks in large part to social media—but it’s far from just a passing fad. Rooted in solid dermatological science, the practice is based on the skin’s need to retain moisture and protect itself from environmental and product-related stressors. For individuals with dry, irritated, or compromised skin, slugging can be a game-changing technique to lock in hydration and speed up healing. However, it’s not universally beneficial. People with oily or acne-prone skin need to approach it with caution, as improper use can lead to congestion or flare-ups. Slugging is not a miracle cure, nor should it be done blindly based on social media hype. Instead, it should be treated as a powerful tool in your skincare toolkit—one that can yield glowing results when used wisely. Ultimately, slugging isn’t just a trend; it’s a targeted technique. When customized to your skin’s unique needs, it can indeed be a skincare hack that lives up to the hype.
SOURCES
Farris, P. K. (2020). Moisturizers and barrier repair: The science of occlusives and emollients. Journal of Clinical and Aesthetic Dermatology, 13(6), 34–39.
Draelos, Z. D. (2018). Petrolatum: The gold standard of barrier repair. Dermatologic Therapy, 31(3), e12565.
Mukherjee, S., Date, A., Patravale, V., Korting, H. C., Roeder, A., & Weindl, G. (2006). Retinoids in the treatment of skin aging: An overview of clinical efficacy and safety. American Journal of Clinical Dermatology, 7(5), 347–360.
Lacombe, J., & Al-Niaimi, F. (2021). The use of occlusive moisturizers in dermatology: A scientific review. Clinical, Cosmetic and Investigational Dermatology, 14, 213–221.
Del Rosso, J. Q., & Levin, J. (2011). The clinical relevance of maintaining the integrity of the stratum corneum in both healthy and disease-affected skin. Journal of Clinical and Aesthetic Dermatology, 4(9), 22–42.
Bouwstra, J. A., & Ponec, M. (2006). The skin barrier in healthy and diseased state. Biochimica et Biophysica Acta (BBA) – Biomembranes, 1758(12), 2080–2095.
HISTORY
Current Version
JULY, 10, 2025
Written By
BARIRA MEHMOOD