A felon is an infection of the pulp space of a distal finger/thumb that usually occurs secondary to minor trauma.  Prompt treatment is required as there is risk of spread to the flexor tendon sheath and even osteomyelitis.

• Digital block
• Incision and drainage with unilateral longitudinal approach to avoid damage to neurovascular structures and release the vertical septae
  
• Preferred approach as it will limit loss of sensation to finger pad
• Typically on ulnar side (unless little finger)
• Other types of incisions may be made for more severe infections

• Irrigation
• Dry dressing
• Wound check within 2 days
• Oral antibiotics

References

• Evidence-Based Management of Acute Hand Injuries in the Emergency Department. Emergency Medicine Practice. December 2014.