What are the signs of an allergic reaction to a cosmetic product?

The signs of an allergic reaction to a cosmetic product commonly include redness, itching, swelling, or a rash on the skin. These symptoms are indicative of the body's immune response to an allergen, which in this case can be one or more ingredients in the cosmetic product. When an individual is allergic to a certain ingredient, their skin may become inflamed and irritated, leading to noticeable symptoms such as those described.

These reactions can vary in severity, ranging from mild irritation to more severe reactions like hives or anaphylaxis in extreme cases, although the latter is rare with topical products. Recognizing these signs is crucial for cosmetologists and beauty professionals, as it informs them to advise clients appropriately and potentially alter product use to avoid adverse effects.

Other choices do not accurately describe the common symptoms associated with allergic reactions. While blisters and peeling could occur in some cases, they are not typical reactions for initial allergies and might indicate other skin issues. Immediate fading of product color does not correlate with an allergic response. Therefore, the comprehensive nature of symptoms listed in the correct answer emphasizes the common signs practitioners should be vigilant about when assessing client reactions to cosmetic products.