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Redness and irritation are indeed the most common reactions to a skincare allergy, primarily because the body reacts to allergens by increasing blood flow to the affected area, which results in redness. This heightened immune response can lead to inflammation, manifesting as irritation.

In cases of an allergic reaction, the skin's barrier can become compromised, making it more sensitive and reactive to products. This reaction often presents with visible signs such as redness around the affected area and a sensation of irritation, which may include stinging or burning.

While itching and dryness, swelling and blistering, and pigmentation changes can occur in various skin conditions or allergies, they are not as universally recognized as primary symptoms of a common skincare allergy as redness and irritation are. Redness and irritation reflect a direct inflammatory response to allergens commonly found in skincare products like fragrances, preservatives, or active ingredients.