Which of the following are symptoms of a skin allergy to a cosmetic product?

The symptoms of a skin allergy to a cosmetic product typically manifest as localized reactions. Redness, itching, swelling, and rash are classic signs of an allergic response, indicating that the immune system has reacted to an ingredient in the product. These symptoms occur when the skin becomes inflamed and irritated, often leading to discomfort and visible changes such as heat, swelling, and hives.

In contrast, nausea and dizziness, headache and fatigue, as well as dryness and peeling, are not specifically indicative of an allergic reaction to cosmetics. Nausea, dizziness, headache, and fatigue are more general systemic symptoms that may arise from various health issues or environmental factors rather than a localized response to a skincare or makeup product. Dryness and peeling could result from other factors, such as skin type or environmental conditions, rather than a direct allergic reaction. Thus, the identification of redness, itching, swelling, and rash is essential for diagnosing a skin allergy in the context of cosmetics.