Which of the following skin diseases is caused by fungi?

Tinea capitis is the correct answer because it is a fungal infection that specifically affects the scalp and hair. This condition is primarily caused by dermatophytes, which are fungi that thrive in keratin-rich areas of the skin, including the hair and scalp. Tinea capitis is characterized by symptoms such as hair loss, scaling, and sometimes inflammation or itching on the affected areas.

In contrast, the other options refer to different types of infections or conditions. Scabies is caused by a mite, not a fungus; it is an infestation that leads to intense itching and a rash. Impetigo is a bacterial skin infection that often manifests with sores and crusted lesions. Herpes zoster, also known as shingles, results from the reactivation of the varicella-zoster virus, leading to a painful rash. Therefore, the unique association of tinea capitis with fungal pathogens distinguishes it clearly as the correct choice in this context.