Noah Sinclair
A swollen, tender fingernail can be a symptom of several conditions, including paronychia, felon, cellulitis, infectious flexor tenosynovitis, and deep space infection. Paronychia is a common nail infection that can affect both fingernails and toenails and is caused by bacteria or fungi entering broken skin near the cuticle and nail fold. It is characterized by pain, swelling, and tenderness around the nail, with skin that is red and warm to the touch. Felon is an infection of the finger pad, often caused by a puncture wound or cut, and presents as a swollen, painful fingertip with throbbing pain. Cellulitis is a superficial infection characterized by redness, warmth, and tenderness in the affected area. Infectious flexor tenosynovitis involves tenderness, uniform swelling, and pain on extending or straightening the finger, with the finger held in a partially bent position. Deep space infections arise in the web space of the fingers and can be identified by uniform redness and swelling of the affected area.
| Characteristics | Values |
|---|---|
| Type of Infection | Bacterial or Fungal |
| Symptoms | Pain, Swelling, Redness, Pus, Warmth, Tenderness, Abscess, Yellow or Green Discolouration, Dryness, Brittleness, Ridged or Wavy Appearance |
| Diagnosis | Physical Examination, Pus Sample, Tissue Sample, Nail Clipping, Swab of Infected Area |
| Treatment | Antibiotics, Drainage, Antifungal Creams, Lotions, Oral Medicines, Soaking in Warm Water, Lemon and Salt |
| Prevention | Avoid Nail Biting, Keep Nails Trimmed, Smooth Nails, Avoid Cuticle Trimming, Use Gloves, Keep Hands and Feet Clean and Dry |
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What You'll Learn
Paronychia (nail infection)
Paronychia is inflammation of the fingers or toes in one or more of the three nail folds. It can be acute or chronic, with chronic paronychia being present for longer than six weeks. Although both result from loss of the normal nail-protective architecture, their causes and treatments differ. Infections are responsible for acute cases, whereas irritants cause most chronic cases. Acute paronychia usually involves only one digit at a time, while chronic paronychia typically involves multiple digits. Paronychia usually affects the fingernails, whereas ingrown nails are more common with toenails.
Acute paronychia is caused by polymicrobial infections after the protective nail barrier has been breached. Symptoms of acute paronychia appear over hours or a few days. The infection is only in the nail fold and doesn’t extend deeper inside the finger or toe. Symptoms include throbbing pain, redness, warmth, and swelling in the skin around a nail. In some cases, a small collection of pus forms under the skin next to the nail, or underneath the nail itself. Often, only one nail is affected. With proper treatment, acute paronychia usually heals within 5 to 10 days with no permanent damage to the nail.
Chronic paronychia is characterized by symptoms lasting at least six weeks and represents an irritant dermatitis to the breached nail barrier. A chronic paronychia usually causes less dramatic symptoms than an acute paronychia. Typically, the area around the nail is tender, red and mildly swollen; the cuticle is missing; and the skin around the nail feels moist or "boggy." Chronic paronychia is more commonly caused by irritation from occupational or environmental exposures. Less often, it may be caused by a chronic bacterial or fungal infection.
The treatment for acute paronychia consists of warm soaks with or without Burow solution or 1% acetic acid. Topical antibiotics should be used with or without topical steroids when simple soaks do not relieve the inflammation. The presence of an abscess should be determined, which mandates drainage. Oral antibiotics are usually not needed if adequate drainage is achieved unless the patient is immunocompromised or a severe infection is present. Therapy is based on the most likely pathogens and local resistance patterns.
The initial treatment for chronic paronychia consists of the avoidance of inciting factors such as exposure to moist environments or skin irritants. Keeping the affected lesion dry is essential for proper recovery. Choice of footwear may also be considered. Any manipulation of the nail, such as manicuring, finger sucking, or attempting to drain the lesion, should be avoided, as this may lead to secondary bacterial infections. Mild cases of chronic paronychia may be treated with warm soaks, followed by completely drying the digit. The initial medical treatment consists of the application of topical antifungal agents. Oral antifungals may be added in more severe cases.
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Felon (bacterial infection of the finger pad)
A felon is a bacterial infection of the finger pad, often caused by a puncture wound or cut. The infection is usually the result of a break in the skin, which allows bacteria to enter and multiply. The most common bacteria that lead to felons are Staphylococcus aureus and Streptococcus.
Felon finger infections are characterised by pain, swelling, redness, throbbing pain, and warmth in the fingertip. A pus-filled sac (abscess) can also form under the skin. The swelling usually develops over several days and is located in the pad area of the fingertip. As the swelling continues, the area may become tense or hard to the touch.
Felon finger infections are diagnosed through a clinical examination of the finger and a review of medical history. A wound culture can also be performed to determine the specific type of bacterial infection and the best course of antibiotic treatment. Ultrasound imaging may also be used to identify the presence of an abscess.
If recognised early, a felon finger can be treated with oral antibiotics. In addition, your doctor may instruct you to soak your finger in warm water and keep your finger elevated. If an abscess has formed, it will need to be surgically drained.
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Herpetic whitlow (a virus)
Herpetic whitlow is a skin infection caused by the herpes simplex virus (HSV). It is characterised by painful blisters on the skin near the fingernail. The condition is contagious and can spread from person to person through physical contact. It is most commonly transmitted in childhood and can be spread by direct contact with cold sores or "fever" blisters. Herpetic whitlow can also be spread through contact with genital herpes.
The first sign of herpetic whitlow is usually pain and a tingling sensation on the finger. This is followed by local tenderness, redness, and swelling, with an initial crop of blisters or fluid-filled bumps that are most common along the pulp and lateral aspect of the finger. The infection usually involves just one finger but has been known to spread to several fingers. The blisters may spread proximally and involve the nail bed, where lesions may be observed.
Herpetic whitlow is typically diagnosed based on the appearance of the affected finger and the patient's history. The condition has a unique look, with blisters or bumps on the skin near the fingernail and colour changes to the surrounding skin, which is usually darker than normal but can also be red to purple. To confirm the diagnosis, a PCR test or a culture test may be performed.
Treatment for herpetic whitlow focuses on managing the infection and typically lasts about two weeks. It may include compresses two to three times per day, coupled with oral or topical antiviral medication (such as acyclovir) and over-the-counter pain relievers to manage pain. Good wound care is important, and blisters should be covered with bandages to prevent the spread of the virus to others. Keeping the affected area clean with frequent hand washing is also recommended.
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Cellulitis (superficial infection)
A swollen, tender fingernail could be a sign of cellulitis, a superficial infection. Cellulitis occurs when bacteria enter broken skin and cause an infection. It is characterised by redness, warmth, tenderness, and slight swelling of the affected area. If you suspect you have cellulitis, it is important to seek medical attention as early treatment is key to preventing further complications.
Cellulitis is usually a superficial infection, meaning it does not involve the deep structures of the finger. However, if left untreated, cellulitis can progress and lead to a more serious infection. In some cases, the infection may even involve the underlying bone, requiring surgical intervention. Therefore, it is crucial to seek medical advice and treatment as soon as possible.
The treatment for cellulitis aims to address the underlying infection and prevent its spread. Antibiotics may be prescribed to kill the bacteria causing the infection. It is important to take the full course of antibiotics as directed by your healthcare provider, even if your symptoms improve. In addition to antibiotics, drainage may be necessary to remove any pus or fluid buildup. This can be done through incision and drainage procedures, which help to relieve pressure and promote healing.
To support the healing process, it is recommended to keep the affected area clean and dry. Warm soaks after incision and drainage can encourage continued drainage and prevent secondary infections. Additionally, wearing gloves can help protect the area from further irritation or injury. It is important to avoid nail-biting, cutting cuticles, and other behaviours that can create entry points for bacteria.
While cellulitis can occur on its own, it is often associated with another condition called paronychia, a common nail infection. Paronychia is an inflammation of the nail fold, the area where the skin and nail meet, and it can lead to cellulitis if left untreated. Paronychia is characterised by pain, swelling, and tenderness around the nail, along with redness and warmth of the skin. In some cases, pus may build up under the skin or nail, forming an abscess that requires drainage. Both cellulitis and paronychia can have similar symptoms and are often treated with antibiotics and proper wound care.
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Deep space infection
A swollen, tender fingernail could be indicative of a deep space infection, which is a type of finger infection. Deep space infections arise in the web space of the fingers and are also called collar button abscesses.
- Tenderness over the flexor or palm side of the finger, specifically over the tendons in the finger.
- Uniform swelling of the finger.
- Pain when extending or straightening the finger.
- The finger will be held in a slightly flexed or partially bent position.
If you are experiencing any of these symptoms, it is important to seek emergency medical care. Deep space infections can be serious and require prompt treatment to prevent potential disability and loss of the finger.
In the meantime, you can try some home remedies to ease the symptoms of a swollen, tender fingernail, which may be due to a different condition called paronychia. Paronychia is a common bacterial or fungal nail infection that causes inflammation, swelling, pain, and discomfort. It is characterised by redness and swelling of the skin around the nail, often with pus-filled blisters. Mild cases of paronychia can be treated at home by soaking the affected finger in warm water and applying lemon and salt. Keeping the infected area clean and minimising germ exposure is also important. However, if symptoms do not improve or the infection spreads, it is crucial to consult a healthcare professional for further treatment, which may include antibiotics or drainage of pus.
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Frequently asked questions
Paronychia is a bacterial or fungal skin infection that develops around a fingernail or toenail. It is caused by the yeast-like organism Candida.
Symptoms include pain, swelling, and tenderness around the nail. The skin may be red and warm to the touch, and there may be pus-filled blisters, especially with a bacterial infection.
People can treat mild cases of paronychia at home by washing the infected area and minimising germ exposure. Soaking the affected finger or toe in warm water several times a day may also help.
If symptoms do not improve after a few days or the infection spreads beyond the nail, it is important to speak with a doctor. People with severe symptoms, such as a high fever or severe pain, should seek medical attention immediately.
Taking good care of your hands and nails is the best way to prevent paronychia. This includes not biting or picking your nails, trimming your nails regularly, and protecting your nails from exposure to detergents and chemicals by wearing gloves.
