Colorado Cosmetology Written Practice Exam

Indented vertical lines down the nail are called furrows and are often a result of aging or poor nail health. Melanonychia, or dark lines on the nail, can be a sign of melanoma and should be checked by a doctor. Onychophagy, or nail biting, does not typically result in indented lines, but can cause other forms of nail damage. Perionychium is the skin that surrounds the nail and does not affect the appearance of the nail itself. Therefore, B is the most appropriate term for the described condition.