What organism causes ringworm?

Ringworm is caused by a type of fungus, specifically dermatophytes, which thrive on keratin found in skin, hair, and nails. The term "ringworm" refers to the characteristic appearance of the infection on the skin, which often features a red, circular rash with clear centers. While the name includes "worm," it is not caused by any parasitic worm; rather, it is solely a fungal infection. Understanding that ringworm is a fungal infection is critical for proper diagnosis and treatment, which may involve antifungal medications. Recognizing the role of fungi in this context helps differentiate it from other pathogens like bacteria, viruses, and parasites, which cause different types of infections and require different treatment approaches.