Colorado Cosmetology Written Practice Exam

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Which of the following is not a type of nail disorder?

Kolionychia
Onychia
Onychatrophia
Melanin

The correct answer is: Kolionychia

The correct answer is Melanin, as it is not a type of nail disorder. Melanin is a natural pigment found in the skin, hair, and eyes, responsible for their color. Although it plays a role in certain conditions affecting fingernails and toenails—such as pigment changes—melanin itself is not classified as a nail disorder. Kolionychia refers to a condition where the nails become concave and are often associated with systemic health issues. Onychia involves inflammation of the nail matrix, usually due to infection or injury. Onychatrophia refers to the wasting away or deterioration of the nail. All of these terms describe specific nail disorders, highlighting various ways in which nails can be affected by health conditions or trauma.