What is a common sign of a fungal infection on the scalp?

A common sign of a fungal infection on the scalp is the presence of scalp ringworm or dandruff-like flakes. Fungal infections, such as tinea capitis, typically present with symptoms that can include scaling and flaking of the scalp skin, resembling dandruff. The appearance of these flakes is due to fungal irritation and subsequent skin shedding in response to the infection. In cases of scalp ringworm, there may also be round, patchy areas of hair loss where the fungus has affected the hair follicles.

The other options describe symptoms that are not characteristic of a fungal infection. For instance, bleeding sores are more indicative of bacterial infections or other skin conditions, while extreme itching without visible flakes could be linked to allergies or other dermatological conditions rather than a fungal presence. Pustules at the hairline are more commonly associated with bacterial infections or inflammatory skin conditions, not typical signs of fungal infections.