Isla Bennett
Fingernails are a common spot for dirt, bacteria, lint, dead skin cells, and other unwanted materials to accumulate. The space under the fingernails is a perfect environment for bacterial growth, as it is protected by the nail and retains moisture. This makes it challenging to remove dirt and debris, even with vigorous scrubbing. To maintain nail hygiene, it is recommended to keep nails short, wash hands with soap, and use specific cleaning tools like orange sticks or washcloths to gently clean underneath the nails.
| Characteristics | Values |
|---|---|
| What eats the dirt under your fingernails? | Bacteria, keratin debris, skin cells, dirt, lint, personal care products, and pathogens |
| How to prevent or remove dirt under fingernails | Keep nails short, use a bar of white soap when washing hands, use a moisturizing oil instead of thick creams, avoid using a nail brush, use an orange stick to gently sweep beneath nails, wash hands with dish soap, use a soft washcloth, apply moisturizer to prevent overdrying, practice daily nail care, and never share fingernail clippers |
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What You'll Learn
Bacteria, including Staphylococcus and Pseudomonas
The dirt under your fingernails is mostly composed of harmless keratin debris from the underside of the nail and skin cells from the nail bed. However, if the gunk turns from grey to green, it indicates a bacterial infection, which can be caused by Staphylococcus or Pseudomonas bacteria.
Staphylococcus is a type of bacteria that commonly resides on the skin and mucous membranes of healthy individuals. It can cause a range of infections, including skin infections, food poisoning, and respiratory illnesses. When Staphylococcus bacteria get under the fingernails, it can lead to a condition known as paronychia, or nail infection. Paronychia occurs when bacteria enter broken skin near the cuticle and nail fold, causing an infection. This can happen when bacteria get into the skin through cuts in the cuticle or the nail fold.
Pseudomonas, on the other hand, is a type of bacteria that can cause a blue-green discoloration of the nail, known as green nail syndrome. This syndrome is more common in individuals with chronic paronychia, onycholysis, and onychomycosis. While the risk of systemic Pseudomonas infection is low in immunocompetent individuals, it can still lead to nail infections and discoloration.
To prevent and treat bacterial infections under the fingernails, it is important to maintain proper hand and nail hygiene. Keeping nails short and washing hands thoroughly can help reduce the accumulation of dirt and bacteria. In the case of a suspected or confirmed infection, seeking medical advice is recommended. Antibiotics are often used to treat bacterial nail infections, and mild cases of paronychia can be managed with home remedies such as soaking the infected area in warm water.
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Keratin debris from the underside of the nail
The gunk underneath fingernails is most commonly composed of keratin debris from the underside of the nail, as well as skin cells from the nail bed. Nails are made of a protein-rich tissue called keratin. As new cells grow in your toe or finger, the old ones are slowly pushed forward. They harden and become nails.
Keratin debris under the nails can be caused by fungal infections, which can enter the body through an open wound on the hands or feet. Fungi thrive in moist, warm environments, and people whose hands or feet are often wet are at a high risk of developing nail fungus. In addition, people with a suppressed immune system, such as those with diabetes or HIV, may be more susceptible to developing nail fungus.
Fungal infections can change the shape and appearance of the nails but rarely cause them to fall off. They can cause the nails to become discolored (yellow, white, or brown) and separated from the nail bed. In severe cases, toenail surgery may be required to temporarily remove the infected nail so that the nail bed can be treated directly.
To prevent and treat fungal infections, it is important to keep the nails short and straight to prevent sharp edges that can nick the nail bed or become ingrown, providing an entry point for fungi. Keeping the nails clean by scrubbing them with soap and water, or using an orange stick to gently sweep beneath them, can also help remove dirt and debris.
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Dead skin cells
The cuticle, the semi-circular layer of almost invisible dead skin cells that covers the back of the visible nail plate, is another source of dead skin cells under your fingernails. During a manicure, the cuticle is typically removed, but it is important to note that it is the non-living part of the nail and should be handled gently to prevent injury or infection.
Furthermore, the nail plate itself, which is the visible hard nail area, is made of several layers of dead, compacted cells that give the nail its strength and flexibility. While the nail plate is strongly attached to the nail bed, it does not contain any nerves or blood vessels. The nail bed, located beneath the nail plate, is where the active tissue generates cells that harden as they move outward, forming the nail plate.
To maintain healthy nails and prevent the buildup of dead skin cells, it is important to practice proper nail care. Keeping your nails short and adopting strategic handwashing techniques can help remove dirt and debris. Using a moisturizing oil instead of thick creams can also prevent the trapping of dirt. If you notice any changes in your nails, such as discolouration or thickening of the skin, it is recommended to consult a dermatologist for evaluation and appropriate treatment.
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Dirt and lint
When washing your hands, it is important to pay special attention to your nails and ensure that you get soap and water under your nails to effectively remove dirt and debris. Using a bar of white soap in the shower can help pull out dirt and make the whites of your nails brighter. If you want to clean under your nails without trimming them, you can use an orange stick (also known as a cuticle stick) to gently sweep beneath your nails.
It is also important to consider the type of moisturizer you use after washing your hands. Thick creams can trap dirt and bacteria under your nails, so it is recommended to use a moisturizing oil or a product containing lanolin instead. Keeping your nails moisturized can help seal in moisture and prevent dryness.
Additionally, it is advised to avoid using a nail brush as it cannot be properly sterilized and can harbor bacteria. Instead, use a soft washcloth to clean your nails and cuticles, and always clean the washcloth after each use.
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Pathogens from raw meat
The dirt under your fingernails is mostly made up of harmless keratin debris from the underside of the nail, as well as skin cells from the nail bed. However, it can also include harmful bacteria, dirt, lint, and personal care products.
Raw meat is a well-known carrier of foodborne pathogens that can cause illnesses and lead to food safety issues. These pathogenic bacteria can invade our bodies or produce toxins that cause illnesses. They are invisible and odourless but are generally killed by normal cooking conditions, such as cooking to a core temperature of 75°C. However, it is important to note that certain pathogenic bacteria, like Clostridium perfringens, exist in spore form and are not easily destroyed by normal cooking temperatures. Instead, the heat may activate the spores, causing them to multiply rapidly in food kept at ambient temperature for extended periods.
To prevent foodborne illnesses, it is crucial to practice good hygiene and food safety measures. This includes thoroughly washing hands, cutting boards, knives, and other utensils after handling raw meat. Additionally, separate cutting boards should be used for ready-to-eat foods and raw meat to avoid cross-contamination.
A study in Dharan, eastern Nepal, found that raw meat samples from local markets were heavily contaminated with spoilage and pathogenic organisms. For example, E. coli was present in 54% of samples, Salmonella spp. in 34%, and Staphylococcus aureus in 68%. These bacteria are transmitted via the faecal-oral route, and their presence in raw meat poses a significant public health risk.
To summarise, raw meat can harbour various pathogens that can cause illnesses, and proper handling, cooking, and hygiene practices are essential to mitigate these risks.
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Frequently asked questions
The gunk under your fingernails is most likely keratin debris from the underside of the nail, as well as skin cells from the nail bed. Other common culprits include dirt, lint, personal care products, and bacteria.
To get rid of the dirt under your fingernails, keep your nails short and clean them regularly. When washing your hands, use soap and water, and dig your nails into the soap to help pull out dirt and debris. You can also use an orange stick to gently sweep under your nails.
Keeping your fingernails clean is important because they can harbor bacteria and other pathogens that can cause infections. The fingers are the 10 dirtiest things on your body, and 80% of all infections are transmitted through direct or indirect contact.
Artificial nails tend to harbor more bacteria than natural nails, especially if they are longer and covered in nail polish. The area between the organic nail and the fake nail can be a breeding ground for pathogens. Therefore, it is important to keep artificial nails clean and well-maintained to reduce the risk of infection.
