Which of the following is a sign of a potential allergic reaction to a hair product?

Itching or redness on the scalp is a key indicator of a potential allergic reaction to a hair product. Allergic reactions happen when the immune system responds abnormally to a substance, in this case, an ingredient in the hair product. Symptoms of such reactions often include irritation, discomfort, or inflammation in the affected areas. When a client experiences itching or redness, it signals that the scalp may be reacting negatively to the product, indicating a need for immediate attention and possibly discontinuing use of the product to prevent further irritation or complications.

In contrast, increased shine, improved texture of hair, or options implying no symptoms do not represent any adverse reactions. These characteristics are generally considered positive outcomes of using hair products rather than signs of a negative response. Recognition of allergic reactions is crucial in cosmetology, ensuring the safety and well-being of clients as well as maintaining their trust in professional services.