Dermasté Journal

Skincare science,
considered carefully.

Evidence-aware guidance on ingredients, formulation, skin barrier science, midlife skin, and the claims cosmetics can honestly support.

When to Stop Using a New Product

posted in: Sensitive Skin |

Man setting an unfamiliar serum aside while familiar moisturizer products remain on a dark-green tray.

When to Stop Using a New Product: A small-area use test may reveal obvious intolerance but cannot rule out delayed allergy or reactions under full-face use.

Irritation and Allergy Are Not the Same Reaction

posted in: Sensitive Skin |

Two ivory silk swatches showing a blush patch and separate plum speckles beside clear gel droplets.

Irritation and Allergy Are Not the Same Reaction: A small-area use test may reveal obvious intolerance but cannot rule out delayed allergy or reactions unde.

Patch Testing Skincare at Home: Useful, but Not a Guarantee

posted in: Sensitive Skin |

Woman applying a small clear-gel dab to a limited area of her inner forearm.

Patch Testing Skincare at Home: Useful, but Not a Guarantee: A small-area use test may reveal obvious intolerance but cannot rule out delayed allergy or rea.

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