Which of the following is an indication of onychophagy?

Onychophagy, commonly known as nail biting, is characterized by the appearance of short nails with uneven edges. Individuals who engage in this habit tend to bite their nails down to the quick, resulting in nails that are not only short but also often display jagged or irregular edges due to the trauma they endure from being bitten. This habit can lead to additional issues, such as damage to the nail bed and surrounding skin, but the most direct and visible indication of onychophagy is the overall shape and condition of the nails being noticeably shorter and uneven.

Thickened nail texture may indicate other conditions like fungal infections or trauma. Separation of the nail can result from various issues, such as nail disease or injury, and a swollen nail bed might suggest an infection or inflammation, none of which are specific indicators of onychophagy. Therefore, the presence of short nails with uneven edges distinctly points towards the characteristic behavior of nail biting.