What might be a symptom that a client is allergic to a product?

A symptom that indicates a client may be allergic to a product is redness or swelling on the skin. Allergic reactions often manifest as localized inflammation, which can result in redness, swelling, hives, or even itching and burning sensations. This is the body's immune response to a substance it mistakenly identifies as harmful. Recognizing these symptoms is crucial for cosmetologists, as it allows them to take the necessary steps to address the client’s needs and ensure their safety during treatments.

In contrast, symptoms such as increased energy or all-day hydration do not relate to allergic reactions. Increased energy is typically not a physical response to a topical product, and all-day hydration suggests a positive outcome from a product rather than a negative allergic response. Faster hair growth similarly is not an indicator of an allergy; rather, it may be associated with other factors like hormonal changes or specific hair growth products. Understanding these distinctions helps professionals in the beauty industry to provide safe and effective services.