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A common symptom of an allergic reaction during a hair service is redness and irritation of the skin. This occurs because an allergic reaction triggers the body’s immune response, leading to inflammation in the affected areas. In the context of hair services, this can manifest as a localized reaction on the scalp or skin where products, such as dyes or chemical treatments, have been applied. The redness is a clear indicator that the skin is reacting to a substance, and irritation often accompanies this response, causing discomfort and a potential rash. Recognizing these symptoms is crucial for a barber or stylist, as it informs them about the need to stop the service and address any adverse effects that the client may be experiencing. Other options, like hair loss or fungal growth, are not typically associated with immediate allergic reactions but may suggest different underlying conditions or issues. Increased shine does not pertain to allergic reactions and is instead a characteristic of healthy, well-treated hair.