What does onychosis refer to?

Onychosis refers to any deformity or disease of the natural nail, making this the correct answer. This term encompasses a wide range of conditions that can affect the nail's appearance, structure, or health, including issues such as onychomycosis (fungal infection), ingrown nails, or changes in nail color and texture. Understanding onychosis is critical for nail technicians, as recognizing these conditions can help in providing the appropriate care and treatments for clients.

The other options, while related to nail health and conditions, represent more specific issues. For example, a fungal infection of the natural nail is a particular type of onychosis but does not encompass all deformities or diseases of the nail. Inflammation of the nail matrix and infection around the nail are also specific conditions that fall under the broader umbrella of onychosis, but they do not cover the entire spectrum of potential nail disorders.