
Have you ever noticed a greenish discoloration on your nails after removing acrylics? This condition is known as green nail syndrome or greenies, and it's caused by a bacterial infection or fungus. The bacteria responsible for this unsightly discoloration is called Pseudomonas aeruginosa, which can be found in water, including swimming pools, hot tubs, and even your bathtub. When moisture gets trapped under your nails, it creates the perfect environment for this bacteria to thrive, leading to an infection that turns your nails green. While it may be embarrassing, it's important to address this issue and take steps to prevent it from occurring in the future.
| Characteristics | Values |
|---|---|
| Name | Pseudomonas nail infections, "greenies", chloronychia |
| Cause | Pseudomonas aeruginosa bacteria |
| Appearance | Dark green or black discolouration |
| Location | Between the nail plate and the nail bed, or between the acrylics and the nail plate |
| Prevention | Keep nails clean and dry, avoid soaking in water for too long, trim nails, disinfect with an antifungal like tea tree oil |
| Treatment | Let nails grow out, apply rubbing alcohol or vinegar, use 1% acetic acid treatment, antibiotics, or anti-fungal cream |
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What You'll Learn

Green nail syndrome
The greenish discolouration occurs due to the waste produced by the pseudomonas aeruginosa bacteria. As the infection progresses, the stain will spread on top of or under the nails and turn dark green or black. It is important to note that the presence of this colour does not always indicate an infection, especially if you have recently applied a green-coloured nail product.
To prevent green nail syndrome, it is crucial to ensure your nails are clean and thoroughly dry before applying false nails or acrylics. Trimming your nails is also important to avoid trapping bacteria. If you plan to engage in activities where your hands will be submerged in water, such as swimming or dishwashing, it is recommended to wear gloves and take extra care when drying your hands and nails.
If you experience green nail syndrome, there are several ways to address it. You can remove the false nails carefully, keep your hands clean, and let them air out, which usually results in the disappearance of the green discolouration within a couple of weeks. You can also try treating the affected nails with rubbing alcohol or vinegar to sanitise them and prevent the further spread of the bacteria. Additionally, you may consider using products specifically designed to maintain nail health, such as Dr. G's Clear Nail.
In more severe cases of infection, it is advisable to consult a doctor for proper treatment. They may suggest a 1% acetic acid treatment, antibiotics, or an anti-fungal cream. While waiting for your nails to recover, it is important to promote nail health and prevent future infections by maintaining good hygiene practices and ensuring your nails are clean and dry before any nail enhancements are applied.
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Chloronychia
The waste produced by this bacterium is responsible for the green discolouration on your nails. As the infection progresses, the stain will spread on top or under your nails and turn dark green or black. The infection can occur in two places: between the nail plate and the nail bed, or between the acrylics and the nail plate.
If you notice a green discolouration on your nails, it is recommended to let your nails grow out and heal before applying any further products. You can treat your nails with rubbing alcohol or vinegar to help them heal. If the discolouration is deep under your nails, you may need to see a doctor for proper treatment, such as a 1% acetic acid treatment, antibiotics, or an anti-fungal cream.
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Pseudomonas aeruginosa
Green nail syndrome, also known as chloronychia, is a bacterial infection caused by Pseudomonas aeruginosa, a type of Gram-negative bacteria. It results in a blue-green or greenish-yellow biofilm on the surface of the nail, known as chloronychia. This bacterial infection is not a typical part of the skin's natural flora, and it rarely infects intact nails. However, when an infection does occur, P. aeruginosa colonizes moist areas of the skin, including the nails, and can lead to green nail syndrome.
Predisposing factors for developing green nail syndrome include underlying nail disorders such as onycholysis, onychotillomania, chronic paronychia, and chronic exposure to water, soaps, or detergents. Onycholysis, characterized by the separation of the nail plate from the nail bed, can lead to a secondary P. aeruginosa infection, especially in warm and moist environments. Chronic paronychia, an inflammation of the nail fold, can also increase the risk of P. aeruginosa infection. Additionally, occupational factors play a role, with green nail syndrome commonly affecting individuals whose work involves frequent exposure to water or chemicals, such as homemakers, barbers, nail salon technicians, and medical personnel.
The treatment for Pseudomonas aeruginosa infections aims to address the underlying causes and prevent further complications. Trimming the nails, keeping nails dry, and avoiding trauma to the affected area are essential steps in managing the infection. Topical antibiotics, such as fluoroquinolones or aminoglycosides, can be applied directly to the nail bed to eliminate the bacteria. In more severe cases, oral antibiotics may be necessary to treat the infection systemically. It is important to note that home remedies such as vinegar (acetic acid) soaks or diluted chlorine bleach solutions have been tried by patients, but their effectiveness is not supported by reported evidence.
While P. aeruginosa is the most common bacterial cause of green nail syndrome, other bacteria can also be responsible, including Klebsiella spp. and Gram-positive bacteria like Staphylococcus aureus. These bacteria can take advantage of opportunities provided by nail disorders or frequent exposure to moisture and chemicals to establish an infection. In rare cases, an underlying bone infection may occur, requiring imaging, such as an X-ray, for diagnosis.
To prevent and manage green nail syndrome caused by Pseudomonas aeruginosa, it is crucial to maintain good nail hygiene. This includes avoiding nail biting, cutting nails too short, or picking at cuticles. Keeping the hands and nails clean and dry can help reduce the risk of infection and create an unfavorable environment for bacterial growth. In the case of an infection, early diagnosis and appropriate treatment, including antibiotics and proper nail care, can effectively resolve the condition and prevent its recurrence.
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Preventing green nails
The green discoloration under your nails is likely caused by a common bacterial infection known as "greenies," or pseudomonas. This phenomenon typically occurs in humid environments, such as under artificial nails that have lifted, allowing moisture to get trapped and providing the perfect conditions for the pseudomonas bacteria to thrive. While this infection is usually superficial and treatable, it is essential to take preventive measures to ensure your nails remain healthy and infection-free. Here are some tips to prevent green nails:
Keep Nails Clean and Dry
Maintain good nail hygiene by frequently washing your hands and keeping your nails clean and dry. Pseudomonas bacteria thrive in moist environments, so it is crucial to avoid prolonged exposure to water and to dry your nails thoroughly after washing your hands. Consider using an additional dehydrator if you have naturally oily nail beds.
Sanitize Tools and Equipment
Disinfect your nail tools and manicure equipment regularly. Bacteria can easily spread through contaminated tools, so it is important to sanitize reusable items and dispose of disposable ones, such as nail files and buffers, after each use. This helps prevent the spread of bacteria and reduces the risk of infection.
Avoid Trapping Moisture
Before applying any nail enhancements, ensure that your nails are thoroughly dry. When applying artificial nails, take the time to properly prep your nails to avoid trapping moisture underneath. Bacteria-laden droplets can get trapped under dip nails, creating an ideal environment for pseudomonas to grow.
Use Nail Treatments
Consider using nail treatments to keep your nails healthy and prevent infections. Treat your nails with rubbing alcohol or vinegar to sanitize them and help prevent the spread of pseudomonas. You can also use a nail oil or serum that repels moisture and nourishes your cuticles, reducing the risk of bacterial growth.
Practice Good Hand Hygiene
Frequently wash your hands with soap and water or use an alcohol-based sanitizer to keep bacteria at bay. Proper hand hygiene is essential in preventing the spread of bacteria to your nails. Remember to dry your hands thoroughly after cleansing to create an unfavorable environment for bacteria.
By following these preventive measures, you can effectively reduce the risk of green nail syndrome and maintain healthy and beautiful nails.
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Treating green nails
The green stuff that grows under your nails is likely to be a common bacterial infection known as "greenies", or technically, chloronychia. It is caused by the pseudomonas aeruginosa bacteria, which thrives in warm, damp, and almost oxygen-free environments.
If you have green nails, don't panic. While unsightly, greenies are not a cause for major concern and can be treated and prevented quite easily.
Firstly, determine whether the discolouration is, in fact, caused by bacteria and not by a staining from a previous manicure. If you are certain it is not a stain, then you likely have a pseudomonas infection.
If the infection is mild, it is recommended that you remove any nail enhancements, keep your nails dry, and let them heal and grow out naturally. You can also treat the nails with rubbing alcohol or vinegar to help prevent the pseudomonas from spreading.
If the infection is more severe, and you are unable to buff out the discolouration, it is advised that you contact a doctor. They may suggest a 1% acetic acid treatment, an antibiotic, or an anti-fungal cream.
To prevent greenies, it is important to ensure your hands and manicure equipment are thoroughly washed and disinfected. Proper nail preparation is also key to avoiding green nail syndrome.
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Frequently asked questions
The green stuff under your nails is likely a build-up of bacteria called pseudomonas aeruginosa, which is commonly found in water. This bacterium thrives in damp, warm, and nearly oxygen-free environments, such as under acrylic nails if moisture is not thoroughly removed.
While the presence of this bacterium can cause a nail infection (paronychia) and lead to discoloured nails, it does not usually cause serious health problems. However, in rare cases, if left untreated, paronychia can progress and lead to a more severe infection that may require medical attention.
To get rid of the green discoloration, you can try removing any remaining acrylic nail material, gently buffing away the affected area, and soaking your hands in warm water with a few drops of tea tree oil. You can also treat your nails with rubbing alcohol or vinegar to sanitize them and prevent the bacteria from spreading. If the discoloration persists or you suspect an infection, consult a healthcare professional for advice.











































