A dermatophyte is a type of fungus that specifically infects the skin, hair, and nails. These fungi thrive in warm, moist environments and can cause various skin conditions, such as ringworm, athlete's foot, and jock itch. Dermatophytes feed on keratin, a protein found in these body parts, leading to symptoms like itching, redness, and flaking. Common genera of dermatophytes include Trichophyton, Microsporum, and Epidermophyton. These fungi can be transmitted through direct contact with an infected person or by sharing contaminated items, such as towels or shoes. Treatment often involves antifungal medications to eliminate the infection.