Nail Plate Characteristics:
* Shortened Nail Plate: The most obvious characteristic. Nail plates are significantly shorter than normal due to constant biting.
* Irregular Nail Edge: Instead of a smooth, curved edge, the nail edge is often jagged, uneven, and torn. It can have a "sawtooth" appearance.
* Distorted Shape: Repeated biting can distort the natural shape of the nail. They can become wider, more rounded, or even fan-shaped.
* Thin and Weak Nails: Biting weakens the nail structure, making them thinner, more brittle, and prone to splitting or peeling.
* Ridges and Grooves: Horizontal or vertical ridges can develop on the nail plate due to damage to the nail matrix (where the nail grows).
* Hyponychium Exposure: The hyponychium (the skin under the free edge of the nail) may be exposed, damaged, or receded due to biting. This increases the risk of infection.
Surrounding Skin (Cuticle & Perionychium) Characteristics:
* Damaged Cuticle: The cuticle, which protects the nail matrix, is often severely damaged or absent. It may be torn, ragged, bleeding, or inflamed.
* Hangnails: These are small pieces of torn skin around the nail, which are common in nail biters.
* Swelling and Redness: The skin around the nails can become inflamed, swollen, and red due to constant irritation and potential infection.
* Calluses or Thickened Skin: Chronic biting can lead to calluses or thickened skin around the nails.
* Paronychia (Infection): Bacterial or fungal infections can occur in the nail folds (the skin surrounding the nail) due to breaks in the skin barrier.
Other Potential Characteristics:
* Bleeding: Frequent biting can cause bleeding from the nail bed or surrounding skin.
* Pain and Tenderness: The area around the nails can be painful and tender to the touch, especially when the skin is inflamed or infected.
* Self-Consciousness: People who bite their nails often feel self-conscious about the appearance of their hands and may try to hide them.
* Dental Problems: In some cases, chronic nail biting can contribute to dental problems like malocclusion (misalignment of teeth) or temporomandibular joint (TMJ) disorders.
It's important to remember that the severity of these characteristics can vary depending on the individual and the extent of their nail-biting habit.