Noah Sinclair
The skin growing over or under your fingernails can be attributed to several factors. The skin bordering the bottom of your nail is called the proximal nail fold, and a thin layer of skin, known as the cuticle, grows over the nail there. The cuticle is dead tissue at the base of your nails that's attached directly to your nail plate. It provides a barrier to protect your nails from infection by bacteria, dirt, and fungus. However, cuticle overgrowth can occur due to long-term stress, health conditions, or lack of maintenance. Another common cause of skin overgrowth under the fingernail is Pterygium inversum unguis (PIU), where the hyponychium (the skin just under the free edge of your nail) attaches to the underside of the nail as it grows.
| Characteristics | Values |
|---|---|
| Skin growing under the fingernail | Hyponychium |
| Cause of skin overgrowth under the fingernail | Pterygium inversum unguis (PIU) |
| Cause of PIU | Autoimmune conditions such as lupus, psoriasis, external factors, etc. |
| Proximal nail fold | The skin bordering the bottom of the nail |
| Cuticle | A thin layer of dead skin that grows around the edge of toenails and fingernails |
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What You'll Learn
- The hyponychium is the skin under the free edge of the nail
- Pterygium inversum unguis (PIU) is an uncommon condition that causes skin overgrowth
- Skin overgrowth can be caused by gel manicures, acrylic nails, or nail biting
- Cuticles are a thin layer of dead skin that grows around the edge of nails
- Chronic stress can cause unusual nail growth
The hyponychium is the skin under the free edge of the nail
The hyponychium is a thick layer of skin located under the free edge of the nail plate at the distal edge of the finger. It is a strong seal that prevents harmful bacteria, allergens, and pathogens from entering the delicate areas of the nail, such as the nail bed and matrix. The skin in this region contains white blood cells to help prevent infection.
The hyponychium is an important protective barrier that safeguards the nail from germs and debris. However, it can sometimes overgrow and become thicker, causing discomfort and making nail trimming painful. This overgrowth can occur due to various factors, including the use of gel manicures, acrylic nails, nail injury, or underlying skin conditions such as nail psoriasis and fungal infections.
While the hyponychium is generally beneficial, overgrowth can lead to a condition called inverse pterygium or onycholysis, where the nail plate separates from the nail bed. To manage thickened skin, individuals can use cuticle removers or cuticle oil to soften and gently push back the hyponychium. It is important to consult a doctor instead of a nail technician for proper evaluation and treatment.
The presence of nerve endings within the hyponychium serves as an alert system. When the protective seal is compromised, these nerve endings signal discomfort or pain, warning of potential damage or infection. In some cases, the hyponychium may thicken or become discoloured, indicating a possible infection.
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Pterygium inversum unguis (PIU) is an uncommon condition that causes skin overgrowth
Skin growing on the fingernail is known as Pterygium inversum unguis (PIU). It is an uncommon and rare nail disorder characterised by the adherence of the distal portion of the nail bed to the undersurface of the nail plate. This results in the obliteration of the distal groove and a subungual extension of the hyponychium. The hyponychium is the thick skin under the nail tip, and in PIU, it attaches to the underside of the nail as it grows, leading to skin overgrowth under the fingernail.
PIU can be congenital, present from birth due to an early defect in fetal development, or acquired later in life. The acquired form is most commonly associated with autoimmune conditions such as lupus but has also been linked to external factors like gel manicures, nail psoriasis, and fungal infections. In some cases, it may be idiopathic, with no known cause.
The exact origin and cause of PIU are not yet fully understood by scientists. Management and treatment of PIU are also not well-defined, and various approaches, including keratolytics, topical steroids, and surgical excision, have been reported as ineffective. The most effective strategy is to address the underlying cause of PIU, and patients require long-term follow-up examinations to monitor for the development of connective tissue diseases.
If you notice skin overgrowth on your fingernails or any other nail changes, it is recommended to consult a dermatologist for evaluation and appropriate management. They can provide guidance on managing the condition and help rule out any associated rheumatologic diseases.
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Skin overgrowth can be caused by gel manicures, acrylic nails, or nail biting
The hyponychium is the thick skin under your nail tip. It can overgrow and become even thicker, making nail trimming painful and undesirable aesthetically. This condition is called subungual hyperkeratosis and can be caused by a variety of factors.
One of the causes of skin overgrowth under the fingernail is gel manicures. The chemicals used in gel manicures can irritate the skin and lead to a nail bed infection, which can cause the skin under the nail to thicken and the nail to separate from the nail bed (onycholysis). Similarly, acrylic nails can also cause skin overgrowth under the nails. The presence of acrylic nails can create tiny cracks in the nails or cuts in the skin, providing an entry point for bacteria, which can lead to a nail infection. In both cases, switching to regular manicures can help reverse the condition.
Another factor that can contribute to skin overgrowth is nail biting. Nail biting can create small cuts in the skin around the nail, allowing bacteria to enter and cause a nail infection (paronychia). This infection can lead to the thickening of the skin under the nail and nail discolouration. Avoiding nail biting and maintaining proper hand hygiene can help prevent this issue.
Additionally, underlying conditions such as nail psoriasis and fungal infections can also lead to skin overgrowth under the fingernails. In such cases, it is essential to consult a dermatologist, especially if the area is bleeding, discoloured, or swollen. They can provide appropriate treatment options, such as antibiotics or other specialised procedures.
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Cuticles are a thin layer of dead skin that grows around the edge of nails
The skin bordering the lower end of the nail is called the cuticle. Specifically, it is the thin layer of dead skin that grows around the edge of the toenails and fingernails. It is also known as the proximal nail fold. The cuticle provides a barrier to protect your nails from infection by bacteria, dirt, and fungus. Without cuticles, your nails would be susceptible to infection.
The cuticle should not be removed or cut, although some people are tempted to if their cuticles overgrow. Cuticle overgrowth is mostly a cosmetic issue and does not usually cause problems. However, unmanaged overgrowth can lead to other issues. To keep your cuticles healthy, you can gently push them back with a cuticle stick, starting at the base of your nail. Be gentle to avoid damaging your cuticles or lifting your nail. You can also use nail scissors to remove any loose skin, but do not use them on your cuticles.
There are other reasons why skin may grow under the fingernail. This skin is called the hyponychium and is located near the fingertip, just beyond the distal end of the nail bed. The hyponychium can thicken and overgrow, which can make trimming nails painful. The overgrowth may be caused by getting gel manicures, wearing acrylic nails, or biting your nails. It can also be caused by nail psoriasis and fungal infections.
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Chronic stress can cause unusual nail growth
Our bodies react to stress in various ways, and chronic stress can have a detrimental impact on our health. While we may be aware of the emotional and physical toll that stress can take, it can also manifest in other ways, such as through our nails.
Nails can be a window into our overall health, and they can provide physical signs of stress. Beau's lines, for instance, are indentations that can appear on the nails due to stress. These lines are caused by a slowdown in nail growth, which can occur during periods of high fever or extreme illness, such as COVID. When nail growth resumes, you are left with an indent, almost like a timeline of your body's stress response.
Stress can also lead to the development of poor habits, such as nail-biting or picking at the cuticles. This can cause what is known as a habit tic nail deformity, which is a vertical ridged groove in the nail. The act of nail-biting can also lead to soreness and an increased risk of infection as it can cause the nail plate to separate from the nail bed.
Additionally, stress can compromise the skin's natural barrier, exacerbating existing skin conditions. This can lead to irritated and dehydrated skin, further impacting the health of the nails.
The impact of stress on nails is not just limited to their physical appearance. Nails can also be used as a retrospective biomarker of chronic stress. Cortisol, a hormone released during stressful periods, accumulates in nails over time. By analyzing nail clippings, it may be possible to track an individual's stress levels and identify potential health concerns associated with chronic stress, such as acute coronary syndrome and depression.
While nails can provide insight into our stress levels, it is important to remember that they are just one piece of the puzzle. Stress can affect everyone differently, and a comprehensive assessment of an individual's health and well-being should always be conducted by a healthcare professional.
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Frequently asked questions
The skin under your fingernails is called the hyponychium. It acts as a barrier to prevent germs and debris from getting under your nails. Pterygium inversum unguis (PIU) is an uncommon condition that causes the hyponychium to attach to the underside of the nail as it grows.
There are several factors that can cause the hyponychium to overgrow, including gel manicures, wearing acrylic nails, biting your nails, nail psoriasis, and fungal infections.
You can use a cuticle stick to gently push back your cuticles, starting at the base of your nail. Be careful not to lift your nail or damage your cuticles. You can also use nail scissors to remove any loose skin, but avoid using scissors on your cuticles.
In most cases, you can treat overgrown hyponychium at home and you don't need to contact a doctor. However, if you notice signs of infection such as bleeding, discolouration, or swelling, it is recommended to visit a dermatologist.
