Symptoms include round, scaly lesions on the scalp. These areas may be red or swollen (inflammed). The patient may have areas that appear bald, due to hair that has broken off. There may be small black dots on the scalp.
Itching of the scalp may be slight, or may not occur at all. Sometimes, there may be pus-filled lesions on the scalp (kerions).
The diagnosis is suspected primarily based on the appearance of the scalp. A skin lesion biopsy with microscopic examination or culture may show dermatophytes. This test is often not necessary to diagnose tinea capitis. A Wood's lamp test may be performed to confirm the presence of a fungal scalp infection.