Which of the following is a sign of an allergic reaction to beauty products?

A sign of an allergic reaction to beauty products typically manifests through symptoms such as redness, itching, swelling, or blistering. These reactions occur as the immune system responds to allergens in the beauty products, leading to inflammation and irritation of the skin.

The presence of redness indicates increased blood flow to the area, while itching and swelling are responses to the irritants affecting the skin's barrier. Blistering can occur as a more severe reaction, illustrating a breakdown in the skin's protective layers.

In contrast, symptoms like dryness and flaking can stem from various issues, including skin conditions or overuse of certain products, rather than an allergic response. Similarly, increased shine and smoothness, or enhanced texture and growth, are signs of healthy skin or effective products but do not indicate an allergic reaction. Thus, the correct identification of typical allergic reaction symptoms is fundamental in assessing and addressing skin sensitivities in beauty practice.