Skin, Hair & Appearance — Same DNA, Different Reflection
Seven evidence-led articles on facial ageing, sun exposure, skin epigenetics, smoking, acne, psoriasis, eczema and hair loss — where genetics meets accumulated exposure.
This content is general research information and does not replace medical advice, diagnosis, or individual treatment.
Skin, Hair & Appearance Research
All 7 articles
Article 1 of 7·7 min read
Same DNA, Different Face: Why Identical Twins Can Look Years Apart
Sun exposure, smoking and other lived factors can leave visible differences even when the genetic starting point is almost identical.
Is Acne Genetic? Twin Studies Say Strongly — But Not Completely
Large twin samples find high heritability for acne liability and severity. The remaining differences are exactly where environment and individual biology enter.
Psoriasis Is Highly Heritable — So Why Do Identical Twins Still Disagree?
A Danish study of more than 10,000 twin pairs found a strong genetic component, but most identical co-twins of an affected person were still not automatically concordant.
Atopic Dermatitis Runs in Families — But Identical Twins Still Diverge
Danish twin data show a strong inherited component to atopic dermatitis, alongside the non-shared exposures that separate even genetically identical siblings.
Identical Sisters, Different Hair Loss: What Twin Research Can — and Cannot — Blame
A small identical-twin study found associations between hair loss and several health or lifestyle factors. The result is intriguing, messy and deeply non-causal.
Can Your Skin Be Older Than You Are? New Skin Clocks Separate Sun-Linked Ageing From Intrinsic Ageing
A 2026 Clinical Epigenetics study developed separate DNA-methylation clocks for endogenous and exogenous skin ageing — with TwinsUK data strengthening the molecular and exposure analysis.
