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A common symptom of a scalp infection is the presence of itching and redness. These symptoms arise as a reaction to the infection itself, as the body responds with inflammation caused by pathogens such as bacteria, fungi, or viruses. The irritation from the infection often leads to discomfort, prompting a strong urge to scratch the affected area, which can worsen the condition and increase the risk of secondary infections.

Dandruff, while it can be a sign of a scalp condition, is generally a result of dry skin or seborrheic dermatitis rather than a direct indication of an infection. Split ends and frizziness pertain to the condition of hair rather than the scalp, and are not indicative of a scalp infection. Therefore, itching and redness are the most relevant symptoms when identifying a possible scalp infection.