Massachusetts State Board Esthetics Practice Test – Exam Prep & Study Guide

The type of fungus known to cause infections of the skin, hair, and nails is dermatophytes. Dermatophytes are a specific group of fungi that have the ability to invade keratinized tissues, which includes the outer layers of skin, hair follicles, and nails. This characteristic allows them to thrive on the protein keratin, leading to conditions such as athlete's foot, ringworm, and nail fungus.

Dermatophytes are divided into three main genera: Trichophyton, Microsporum, and Epidermophyton, all of which are capable of causing superficial fungal infections in humans and animals. The infections are often referred to as dermatophytoses and can be characterized by symptoms such as itching, redness, and scaling of the affected areas.

The other options represent different types of fungi. Molds are a variety of fungi that grow in multicellular filaments and can cause respiratory issues or allergies but do not specifically target the skin, hair, and nails in the same way dermatophytes do. Yeasts, such as Candida, are unicellular fungi that can also cause infections, but they typically affect mucosal areas rather than keratinized tissues. Algae, while sometimes mistakenly associated with fungal infections, are not