Nearly 95% of viral TikTok videos promoting Korean skincare and "glass skin" routines contained at least one potentially misleading dermatologic claim, and none of the 38 videos analyzed was produced by a dermatologist or cited an external reference. The finding comes from a study presented at the European Academy of Dermatology and Venereology (EADV) Congress 2026 in Vienna, Austria, which evaluated the platform's top-performing content on the trend.

A second observational study presented at the same meeting documented the clinical fallout: among 94 patients who developed new or worsening dermatoses after using social media-promoted products, irritant contact dermatitis occurred in 42%, acne onset or significant worsening in 28%, rosacea flares or rosacea-like dermatitis in 12%, post-inflammatory hyperpigmentation in 11%, and superficial chemical burns in 7%.

How the TikTok Analysis Was Conducted

Researchers evaluated popular Korean skincare and glass skin content on TikTok in May 2026. To minimize algorithmic bias, they used a neutral account with no prior engagement history and screened top-performing videos across 5 Korean skincare-related search terms. After exclusions, 38 videos underwent assessment for dermatologic claims, safety information, quality, and reliability using the Global Quality Scale and modified DISCERN instruments.

The results were stark. Of the videos analyzed, 94.7% contained at least one potentially misleading claim. 84% failed to account for differences in skin type. 45% promoted excessive combinations of active ingredients without appropriate safety guidance. 32% promised immediate results.

Basic safety information was nearly absent. Only 1 of the 38 videos mentioned the risk of irritation, 2 addressed sun protection, and none discussed contact dermatitis risk or recommended consultation with a dermatologist. All videos were classified as unreliable or less reliable.

"What surprised us most was how consistently basic safety information was absent," lead author Maria Lúcia Paysano, MD, said in a statement.

Approximately 82% of the videos were created by nonphysician influencers, 11% by beauty brands, and 8% by other beauty content creators. None came from dermatologists.

Paysano cautioned that following such routines without individualized guidance can contribute to irritation, over-exfoliation, acne flares, or skin barrier disruption — particularly when several active ingredients are used at once.

The Clinical Consequences, Product by Product

The companion observational study evaluated 94 patients who developed a new or worsening skin condition after using cosmetic or dermatologic products promoted on social media.

Chemical exfoliants containing alpha-hydroxy acids or beta-hydroxy acids were the most frequently implicated products, reported in 34% of cases. Over-the-counter retinoids followed at 27%, vitamin C serums at 14%, and niacinamide-containing products at 11%.

Usage patterns amplified the risk. Nearly half of patients (48%) had adopted complete skincare routines inspired directly by social media, and 63% were simultaneously using more than 3 active skincare ingredients.

"What was particularly striking was not simply the popularity of these products, but the way they were being used," lead author Ouissal Hormi, MD, said. "Many patients were reproducing complex skincare routines involving several active ingredients simultaneously, often based on advice from non-medical influencers."

Not an Indictment of Korean Skincare

The investigators were explicit: the findings should not be read as evidence that Korean skincare itself is harmful. The concern lies in how sound principles — gentle cleansing, hydration, skin barrier care — get recast on social media into generalized, multi-product, multi-active routines applied without regard to skin type, underlying dermatologic conditions, or potential adverse effects.

Both studies point to a concrete opening for clinicians. Rather than dismissing viral trends outright, dermatologists can redirect patient interest in barrier care and hydration toward evidence-based, individualized regimens and mitigate the risks of algorithm-amplified, one-size-fits-all routines.

"Dermatologists also have an important role to play," Paysano said. "Rather than dismissing social media trends, we have the opportunity to participate in these conversations and make evidence-based skincare information accurate, accessible and engaging."

As algorithm-driven skincare content continues to shape patient behavior, these EADV 2026 data suggest the consultation room — not the For You page — remains the venue where viral routines can be translated into safe, individualized care.