Dr. Kevin Yip

Dr Kevin Yip
Orthopaedic Surgeon
MBBS(UK), FRCS(EDIN), FAM(SING), FHKCOS(ORTHO)

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Paronychia (Nail Infection)

Basics
Description
Paronychia is an infection of the radial or ulnar margins of the nails (lateral fold) of the hand .
 
General Prevention
  • Keep the nail clean and appropriately trimmed.
  • Use gloves for work and washing.
  • Avoid nail biting.
Epidemiology
Incidence
  • It is the most common infection in the hand  .
  • Affects all ages
Risk Factors
  • Nail-biting
  • Manicures
  • Diabetes
Etiology
  • Typically secondary to the introduction of Staphylococcus aureus under the nail fold
  • May be related to a hangnail, biting the nail edge, or manicure instrumentation
Associated Conditions
  • Eponychia:
    • Location: In the periungual tissue at the proximal nail bed
    • Treatment (similar to that of paronychia):
      • Incise with a scalpel.
      • Insert small clamp into the abscess and open the inflammatory pocket.
      • Gram stain, culture, and antibiotics.
  • Felons:
    • Location: Pulp of the finger
    • Treatment:
      • Incise and drain with a lateral incision down to the bone.
      • Spread the tissues with a clamp to disrupt the fibrous septa.
      • Gram stain, culture, and antibiotics
  • Subungual abscess:
    • Location: Beneath the nail
    • Treatment:
      • Administer an adequate digital block.
      • Remove the nail plate and nail.
      • Obtain a specimen for Gram stain and culture.
      • Irrigate and gently debride any purulent material.
      • Replace the nail and nail fold with nonadherent gauze.
      • 1 dose of intravenous antistaphylococcal antibiotics, followed by a 10-14-day course of penicillin or erythromycin.
      • Follow-up as in paronychia is indicated.
Diagnosis
Signs and Symptoms
  • Redness and swelling on the side of the nail fold with pain
  • Possibly becoming fluctuant with discharge
Physical Exam
Examine for infection below the nail plate or in the finger pulp.
 
Tests
Lab
Lab tests are not needed unless the infection is aggressive and is spreading.
 
Imaging
Imaging is not necessary unless the nail infection is chronic, aggressive, unresponsive to treatment, or related to trauma.
 
Pathological Findings
  • Typically, these infections are caused by S. aureus.
  • Changes consistent with acute inflammation are noted.
Differential Diagnosis
  • Eponychia
  • Felons
  • Subungual abscess
  • Tumor or cyst
Treatment
General Measures
  • Early diagnosis: If there is erythema without an abscess, then treat with oral antibiotics and warm, soapy soaks.
  • Abscess:
    • If an abscess has formed:
      • Use a digital block with local anesthetic.
      • Immediately drain with a scalpel.
      • Send purulent material for Gram stain and culture.
      • Remove the lateral 1/5 of the nail if necessary.
      • Irrigate the wound copiously with saline solution through an angiocatheter or needle
      • Pack the wound with nonadherent sterile gauze.
      • Initiate a 10-14-day course of empiric antibiotics: Synthetic penicillin is the drug of choice, or erythromycin for penicillin-allergic patients because S. aureus is the most common causative organism.
  • Chronic paronychia:
    • Often occurs in patient populations exposed to water.
      • These patients often have concomitant fungal infections and should have a topical antifungal ointment or possibly an oral antifungal agent added to the regimen.
Medication
First Line
Synthetic penicillins are the drugs of choice.
 
Surgery
  • Eponychial marsupialization is the most common surgical treatment for chronic paronychia  .
  • Consideration should be given to nail removal, particularly in the presence of a nail deformity.
Follow-up
Prognosis
The prognosis is good, with appropriate care.
 
Complications
Progressive infection may require more aggressive treatment if it involves the pulp of the finger or extends into the bone.

Patient Monitoring
Reevaluate within 48 hours of initial treatment to ensure that treatment is effective.

Miscellaneous
Codes
ICD9-CM
  • 681.02 Paronychia (finger)
  • 681.9 Paronychia with lymphangitis
  • 681.9 Subungual abscess
  • 757.5 Eponychia
Patient Teaching
Prevention
  • Avoid nail-biting
  • Appropriate care of hang-nails
FAQ
Q: What is the treatment for early presentation of a paronychia?
A: Early infections can be addressed nonsurgically with oral antibiotics and soaks 2-3 times daily in warm water and dilute Betadine.

Q: Is chronic paronychia treated in the same way as an acute infection?
A: No. Chronic paronychia is a distinctly different clinical problem and is best managed with surgery with eponychial marsupialization in conjunction with oral antibiotics (if cultures are positive) and possibly antifungal medication.

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