このエピソードについて
Do retinoids thin the skin? No. In fact, they induce dermal remodeling that strengthens your skin’s foundation. But if you’re Asian, the answer to the retinoid burn is more nuanced than the standard pea-sized amount instruction.
📌 Why do retinoids irritate Asian skin more?
The Asian skin phenotype often presents with a thinner stratum corneum and a higher baseline of Trisepidermal Water Loss (TEWL). Most standard retinoid studies were conducted on Caucasian populations. It’s important to consider specific studies which show different zones of the face have different stratum corner thickness, which explains why some areas like the O-zone may be more sensitive to retinoid use.
East Asian skin has also been proven to be genetically susceptible to retinol irritation based on genetic analysis of the Korean population which show 30 distinct genes that are related.
In my research I have mapped the face into distinct vulnerability zones, specifically the O-Zone™️, which requires attention precisely because of these factors.
* 🧬 The “Thinning” Myth: Retinoids compact the top layer while stimulating Type I Collagen synthesis in the dermis, increasing overall thickness.
* 💧 The TEWL Spike: Expect a temporary barrier disruption in Weeks 1–4. If you have a Filaggrin (FLG) mutation (Eczema), this is a strict contraindication.
* 🦠 Zonal Dysbiosis: Retinoids are microbiome modulators that shift C. acnes strains from inflammatory to healthy, commensal flora.
