Is there a term from the field of dermatology and cosmetics that you do not understand? Would you like to know what it means? View the full definition from the La Roche-Posay glossary.

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Reactivity refers to skin reactions such as redness, tightness, itching or stinging. They may be of environmental or vascular origin, and may appear on atopic skin or be caused by contact with a product containing a poorly tolerated ingredient.

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