Sudden skin sensitivity in adult women — reactivity to products that used to be tolerated, flushing, stinging, tightness after cleansing — is almost always driven by one or a combination of four biological changes.
1. Barrier disruption. Over-cleansing, over-exfoliating, high concentrations of actives (retinoids, acids, vitamin C), harsh soaps, or hot showers strip the lipid layer that holds moisture in and irritants out. Transepidermal water loss rises; skin becomes reactive to everything.
2. Estradiol decline. Estrogen supports both barrier function and inflammatory tone. Through perimenopause and menopause, both weaken, producing new sensitivity in women who never had reactive skin before (Rzepecki, 2019).
3. Chronic inflammation. Elevated hs-CRP correlates with increased skin reactivity, redness, and product intolerance. Systemic inflammation shows up on skin as heightened sensitivity — often with fatigue, joint stiffness, and general reactivity.
4. Low omega-3. The EPA and DHA in cell membranes support barrier function directly. Low omega-3 index correlates with elevated transepidermal water loss and inflammatory reactivity (Pilkington, 2011).
Farage's systematic review of sensitive skin (Farage, 2019) established that the majority of adult women who report sensitive skin have measurable barrier compromise on TEWL testing.
What to measure: hs-CRP, omega-3 index, estradiol. Three of the nine on the JenSkin panel.