Isla Bennett
Double fingernails, or polyonychia, is a rare condition in which two or more nails grow on the same finger or toe. It can be caused by a congenital duplication of the distal phalanx of the digit, or by polysyndactyly, which is characterised by a webbed connection between one normal digit and an extra digit. Polyonychia can also be acquired following an accident affecting the nail bed. In some cases, double fingernails can cause pain, discomfort, and cosmetic concerns, requiring surgical excision as treatment. While rare, double fingernails can also be a hereditary condition, passed down through families.
| Characteristics | Values |
|---|---|
| Condition Name | Double nails, also known as accessory nails or polyonychia |
| Description | A rare condition where a person develops two nails on the same finger or toe |
| Symptoms | Pain, discomfort, and cosmetic concerns |
| Causes | Genetic factors, congenital factors, polysyndactyly, or trauma affecting the nail bed |
| Treatment | Surgical excision or nail unit resection procedure under local anesthesia |
| Prevention | N/A |
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What You'll Learn
Double nails are a rare condition
Double nails, or polyonychia, are a rare condition in which two or more nails grow on the same finger or toe. This abnormal growth can cause pain and discomfort and can also be a cause for cosmetic concern. The growth is made of keratinized material and is inseparable from the nail bed, showing a longitudinal depression corresponding to a slight protuberance of the cuticle of the primary nail. Being an extremely rare entity, this condition can lead to difficulty in diagnosis, and surgical excision is the only treatment option for symptomatic relief.
A 28-year-old male patient presented with an abnormal growth of the nail on his middle finger, which was hard and pointed. The growth caused him pain and discomfort, especially during manual work, and he also had cosmetic concerns. There was no history of trauma, infection, or surgery on the finger, and the patient was otherwise healthy. The digital X-ray showed no unusual findings, and the patient planned to consult a specialist surgeon as the growth was causing him psychological distress.
The condition of double nails appears to be autosomal dominant and occurs in families, affecting both males and females. It can be congenital, with a genetic link, or acquired, such as after an accident that affects the nail bed and causes it to split. Most cases are detected incidentally, and only a few patients seek help due to discomfort, pain, or cosmetic reasons. Treatment involves segmental excision of the accessory nail, including the entire double nail with the matrix, proximal fold, and hyponychium.
The rarity of double nails can make diagnosis challenging, and there is limited data available in existing literature. However, it is important to note that this condition can cause pain, discomfort, and cosmetic concerns for patients, and surgical excision is the recommended treatment option. In conclusion, double nails are a rare condition that can impact a person's quality of life and may require surgical intervention for relief.
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They can cause pain and discomfort
Double fingernails, or accessory nails, are an extremely rare condition that can cause pain and discomfort. This is due to the growth of a secondary nail on top of the primary nail, which can lead to pressure and irritation. The secondary nail is made of keratinized material and is often inseparable from the nail bed, causing a longitudinal depression that corresponds to a slight protuberance of the primary nail's cuticle.
The pain and discomfort associated with double fingernails can vary in intensity and may be triggered by touch or pressure. In some cases, the condition can cause cosmetic concerns and diagnostic confusion due to its rarity. Those affected may experience difficulty in performing daily tasks that require the use of their hands, such as typing, writing, or grasping objects. The abnormal growth can also lead to psychological distress and impact one's quality of life.
While the exact cause of double fingernails is unknown, there have been a few reported cases. Most cases are detected incidentally, and only a small number of patients seek medical help due to the associated pain, discomfort, or cosmetic concerns. Surgical excision is currently the only treatment option for double fingernails. The procedure involves removing the accessory nail and can be performed under local anesthesia.
It is important to note that any form of nail discomfort or pain could be indicative of an underlying health condition. For example, nail clubbing, which is a change in the appearance and structure of fingernails or toenails, can be a symptom of lung cancer, lung infections, interstitial lung disease, cystic fibrosis, or cardiovascular disease. Therefore, it is always advisable to consult a healthcare professional if you experience any nail abnormalities, including double fingernails, to ensure proper diagnosis and treatment.
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Surgical excision is the treatment
Double fingernails are an extremely rare condition, and there is little data on the topic in the existing literature. This condition can cause pain, discomfort, and cosmetic concern. The accessory nail should be surgically removed due to these reasons.
In the case of subungual squamous cell carcinoma, a type of nail cancer, wide surgical excision of the nail unit followed by full-thickness skin graft reconstruction has been found to be safe and efficient, with a low rate of recurrence and high patient satisfaction. The surgical treatment consists of an en bloc wide excision of the nail unit, including the two lateral nail folds, the proximal nail fold, and the hyponychium of the finger or toe. A proximal transverse incision is made at the base of the distal phalanx, and this incision is prolonged laterally and distally to the hyponychium at the tip, down to the bone.
Surgical intervention is also indicated in the case of acute infection when antibiotic treatment fails to work within 48 hours. A small incision is made to drain the abscess, and if the infection spreads under the distal nail bed, excision of the entire nail base along with distal avulsion is performed.
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Double nails can be congenital or acquired
Double nails are a rare condition that can be present at birth (congenital) or develop later in life (acquired). Congenital double nails are likely due to genetic factors and can be inherited. They can also be acquired due to trauma or other factors.
Congenital Double Nails
Congenital double nails are present at birth and are likely caused by genetic factors. They can be inherited from parents, with some cases showing autosomal dominant or autosomal recessive inheritance patterns. In an autosomal dominant inheritance pattern, if you inherit the altered gene from one parent, you will express the trait. In an autosomal recessive inheritance pattern, you need to inherit the altered gene from both parents to express the trait. Congenital double nails can be associated with other congenital anomalies or present in isolation. They can affect the fingers or toes, with the fifth toe being a commonly affected site.
Acquired Double Nails
Double nails can also be acquired later in life due to various factors, including trauma. Acquired double nails have been observed in case reports, but their exact cause is not well understood. They can cause pain, discomfort, and cosmetic concerns for patients, leading some to seek surgical excision.
Diagnosis and Treatment
The diagnosis of double nails can be challenging due to their rarity, and they may be detected incidentally. Treatment options include surgical excision, which is the only option for symptom relief and cosmetic improvement. The nail unit resection procedure is performed under local anesthesia, and histopathology is conducted afterward to confirm the presence of nail tissue.
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They can be caused by trauma to the nail bed
Trauma to the nail bed can cause double fingernails. A fingernail or toenail can be injured by a blow to the nail or by trapping the finger or toe in a door or drawer. This type of injury commonly results in a subungual hematoma, or blood under the nail. Subungual hematomas are usually caused by blunt force trauma, such as hitting your nail with a hammer, or crush injuries, like slamming your finger in a door.
In some cases, the nail may lift away from the nail bed as a result of trauma. This can cause cosmetic concerns and may be permanent if the injury includes the base of the nail. If your nail lifts completely off the nail bed, it may be most comfortable to replace the nail and secure it with a bandage. Nails will not reattach to the nail bed once they have separated, but a new nail will usually grow back slowly.
If blood under the nail occupies more than half of the nail area, it could indicate an underlying bone fracture or tissue tear, and a doctor should evaluate the injury. Additionally, if the trauma injures the nail matrix, which is the tissue inside the cuticle where new nail growth originates, a ridge or split can develop. Fortunately, if the matrix heals normally, the deformity will disappear as the nail regrows.
While most bruised fingernails and toenails heal without complications, severe trauma may require the removal of the nail plate to facilitate the repair of underlying tissues. This procedure is performed by a healthcare provider and supports the proper healing of the nail.
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Frequently asked questions
Double fingernail, also known as an accessory nail, is an extremely rare condition in which a person grows an extra nail on their finger.
Double fingernails are caused by a congenital duplication of the distal phalanx of the affected digit. This can be due to congenital or genetic factors, or it can be acquired later in life, such as after an accident that affects the nail bed.
Yes, the treatment for double fingernails is surgical excision, which involves removing the accessory nail and the entire double nail with the matrix, proximal fold, and hyponychium.
Double fingernails can cause pain, discomfort, and cosmetic concerns. The growth is usually made of keratinized material and is inseparable from the nail bed, causing a longitudinal depression corresponding to a slight protuberance of the cuticle of the primary nail.
Double fingernails are extremely rare, and most cases are detected incidentally. Only a few patients seek help due to pain, discomfort, or cosmetic reasons.
