Irritation ek skincare ingredient nahi hai — yeh ek non-immunologic adverse skin reaction hai, matlab skin ka ek aisa response jo immune system se related nahi hota. Isme typically redness, stinging, burning, ya dryness feel hoti hai jab koi topical product lagaya jata hai. Yeh reaction dose aur concentration pe depend karta hai, aur yeh allergic reaction se alag hota hai.