Ava Monroe
The hyponychium is the thick skin just under the free edge of your nail. It acts as a barrier to prevent germs and debris from getting under your nails. While it is generally good, the hyponychium can sometimes overgrow and thicken, making nail trimming painful and increasing the risk of infection. This overgrowth can be caused by a condition called pterygium inversum unguis (PIU), which can be present from birth or acquired later, often associated with autoimmune conditions such as lupus. Other causes of nail issues include fungal infections, eczema, and severe illnesses like heart attacks or COVID-19.
| Characteristics | Values |
|---|---|
| Name | Hyponychium |
| Description | Thick skin under the nail |
| Location | Just under the free edge of the nail, beyond the distal end of the nail bed, near the fingertip |
| Function | Acts as a barrier from germs and debris, preventing external substances from getting under the nails |
| Composition | Contains white blood cells to prevent infection |
| Overgrowth | Can be painful and increase the chance of infection |
| Causes of Overgrowth | Pterygium inversum unguis (PIU), Psoriasis, etc. |
| Treatment | Antifungal medication, Cuticle oil, etc. |
| Nail Growth Rate | Average of 3.5 mm/month for fingernails and 1.6 mm/month for toenails |
| Factors Affecting Growth Rate | Age, sex, season, exercise level, diet, and hereditary factors |
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What You'll Learn
Hyponychium (Under-Fingernail Skin) Thickening
The hyponychium is the thick skin located under the nail tip, near the fingertip. It acts as a protective barrier against germs, bacteria, allergens, and pathogens, preventing them from getting under the nails. While it typically serves a protective function, the hyponychium can sometimes overgrow and thicken. This thickening can affect one, some, or all the fingers.
Hyponychium thickening can cause discomfort and make nail trimming painful. It may also be aesthetically displeasing to some individuals. Pterygium inversum unguis (PIU) is a common cause of hyponychium thickening. PIU occurs when the hyponychium attaches to the underside of the nail as it grows. It is an uncommon condition but is often associated with autoimmune conditions like lupus. Additionally, external factors such as psoriasis, a skin condition characterized by rapid skin cell growth, can contribute to nail psoriasis and subsequent hyponychium thickening.
There are several treatment options for hyponychium thickening. Antifungal medication may be effective if a fungal infection is the underlying cause. Topical corticosteroids prescribed by a doctor can help manage skin thickening in cases of nail psoriasis. Soaking the nails in warm water a few times a day is another home remedy that may help. For immediate relief, cuticle oil or cuticle remover can be applied to soften the thickened skin. However, it is important to avoid cutting the hyponychium as it may introduce an infection. Instead, gently push it back after softening it with oil.
To prevent hyponychium thickening, it is recommended to avoid certain manicures, especially those involving gel or acrylic nails, as the chemicals in these procedures may trigger overgrowth. Maintaining good nail hygiene by regularly cleaning the nail area and avoiding nail biting or picking are also crucial in preventing hyponychium thickening and potential infections.
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Paronychia (Nail Infection)
Paronychia, also known as candidal paronychias, is a bacterial or fungal skin infection that develops around the nail. It is caused by bacteria such as Staphylococcus aureus and Streptococcus pyogenes, which enter the skin through cuts, broken skin, or hangnails. Ingrown nails, irritation from water or chemicals, and trauma to the nail bed or cuticle area can also lead to paronychia. Certain medications, including retinoids, anti-cancer drugs, HIV medications, and some antibiotics, may also cause paronychia.
Paronychia usually affects the nail fold and cuticle, which is the skin at the base of the nail. Symptoms include pain, swelling, and tenderness around the nail, with skin that is red and warm to the touch. Pus may build up under the skin, forming a white to yellow abscess that requires drainage. If left untreated, the nail can become abnormal, with ridges or waves, and may detach from the nail bed. In rare cases, untreated paronychia can spread deeper into the finger or toe and lead to serious bone infections.
Chronic paronychia is a form of the condition that develops slowly and lasts six weeks or longer. It is often associated with irritation from occupational or environmental exposures and can be caused by bacterial or fungal infections. Candida, a type of fungus, is commonly implicated in chronic paronychia. Treatment for this type of paronychia focuses on managing symptoms and may include antifungal medications.
Acute paronychia, on the other hand, develops quickly, and symptoms can be reduced rapidly with treatment. Mild cases can be treated at home by soaking the affected area in warm water several times a day. More severe cases may require antibiotics to clear the infection. It is important to follow the prescribed course of antibiotics to prevent the infection from returning.
To prevent paronychia, individuals should maintain good nail hygiene and avoid biting or chewing their nails or hangnails. Trimming the nails with care and avoiding cutting the cuticles or nails too short is also recommended.
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Pterygium inversum unguis (PIU)
PIU is characterized by the attachment of the distal portion of the nail bed to the ventral surface of the nail plate, resulting in a subungual extension of the hyponychium. This can lead to pain and discomfort when manipulating small objects, typing, or manicuring the nails. The condition is often asymptomatic, but when symptoms do occur, they typically include bleeding or pain after clipping the nails.
The management and treatment of PIU are not well-defined, and various approaches such as topical steroids, keratolytics, and electrocautery-assisted surgical excision have been reported as ineffective. The best course of action is to treat the underlying cause of PIU, which may include ruling out associated rheumatologic or connective tissue diseases. Patients with PIU require long-term follow-up examinations to monitor for the development of related conditions.
PIU predominantly affects women aged 20-70, although it has also been reported in a 22-year-old man with all ten fingernails affected. The rarity of this condition makes it challenging to determine the exact origin and effective treatments. However, by understanding the underlying causes and potential triggers, healthcare providers can work towards managing PIU and improving patient outcomes.
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Ingrown nails
Ingrown toenails can lead to mild to severe infections, with symptoms such as redness, swelling, and the presence of liquid or pus. In rare cases, the infection can spread deeper into the toe and affect the underlying bone. Therefore, it is important to treat ingrown toenails promptly and effectively.
Home treatment for ingrown toenails includes soaking the foot in warm water mixed with Epsom salt or soapy water twice daily, keeping the foot dry otherwise, and gently lifting the edge of the nail to place cotton or dental floss between the nail and the skin. This separation helps the nail grow above the skin. Applying antibiotic cream and a bandage, wearing comfortable shoes, and taking pain relievers can also help manage the condition.
If home remedies do not provide relief within a few days, or if the ingrown toenail is severe, it is important to seek professional medical care. Healthcare providers can perform various procedures to treat ingrown toenails, including partially or completely removing the nail through a procedure called nail avulsion. They may also numb the toe, trim or remove the ingrown portion, and place a gutter splint to ease pain and encourage proper nail growth. In recurrent cases, removing part of the nail along with the underlying tissue may be recommended to prevent regrowth.
While ingrown toenails can be a nuisance and cause discomfort, proper treatment and care can help alleviate the condition and prevent future occurrences. It is always advisable to seek medical advice if symptoms persist or worsen.
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Nail matrix problems
The nail matrix is the area where your fingernails and toenails form and grow. It creates new cells that allow your nail to grow, pushing out old, dead skin cells. The nail matrix is made up of two parts: the germinal matrix and the sterile matrix. The germinal matrix is the area of the nail below the lunula (the white crescent shape at the base of your nail), and it gives a natural curvature to the nail. The sterile matrix is the area of the nail above the lunula.
The nail matrix is an exceptionally delicate structure, and any damage inflicted upon it can have repercussions on the overall health and appearance of the nail. Injuries or trauma to the matrix can manifest as visible imperfections in the nail plate, such as white spots or ridges, and weaken the nail, making it more susceptible to breakage or deformation. Damage to the matrix can also permanently reshape it, resulting in a lasting ridge or deformity in the nail plate.
Fingernail injuries are often caused by a broken finger. Trauma to the nail can cause nail cell production to stop for several weeks, and in some cases, the nail may never grow back. Ingrown nails can occur when nails are cut too short, or when tight shoes are worn. Symptoms of an ingrown nail include swelling and tenderness, and sometimes this area can become infected, turning red, painful, and sore.
Maintaining the well-being of the nail matrix is important for the long-term health and vitality of the nail. Proper care and protection of the matrix can safeguard against potential damage and promote optimal nail growth. This includes practices such as prioritising nail hygiene, avoiding excessive pressure or trauma to the matrix area, and ensuring a well-balanced diet to support strong and resilient nails.
Certain conditions can also affect the nail matrix. Subungual melanoma, for example, is a condition where cancerous cells grow in the nail matrix, causing changes in pigments in the nail. Pterygium unguis is another condition that causes scarring that extends to the nail matrix, resulting in a ridged appearance on the nail plate.
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Frequently asked questions
The hyponychium is the thick skin just under the free edge of your nail. It acts as a barrier from germs and debris, preventing them from getting under your nails.
Pterygium inversum unguis (PIU) is an uncommon condition but a common cause of skin overgrowth under the fingernail. It occurs when the hyponychium attaches to the underside of the nail as it grows. Scientists don’t fully understand PIU, but it can be present from birth or acquired later, often associated with autoimmune conditions such as lupus.
If you are unsure what is causing skin growth under your nail, it is best to consult a dermatologist. Antifungal medication may help if you have a fungal infection. Cuticle oil can also be used to soften the thickened skin.
Overgrown hyponychium can make trimming nails painful, and some people dislike the appearance. It can also increase the risk of infection and make it difficult to keep the area clean.
