Clinicians › Hand
Felon (Fingertip Pulp Infection)

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Overview¶
Hand infections represent a diverse array of entities with the potential for serious morbidity [10]. Paronychias and felons are the most common hand infections [8]. Early identification and treatment are essential to achieve optimal outcomes, as delayed diagnosis can result in amputation or death [1]. Osteomyelitis of the hand is uncommon but can have devastating effects on hand function if not adequately and promptly treated [2]. Furthermore, hand infections are associated with a high rate of complications that are often difficult to manage [4].
It is essential for emergency physicians to be familiar with the management of finger felons and paronychias [5]. This review seeks to direct clinicians in an evidence-based manner, to make them aware of more obscure conditions that can mimic common infections, and to provide an understanding of the relevant anatomy of the fingertip [6].
Anatomy & Pathophysiology¶
General Considerations¶
A thorough understanding of fingertip anatomy is essential to distinguish common infections from more obscure mimicking conditions [6]. Comprehensive knowledge of hand anatomy and function is required for the accurate diagnosis and effective management of deep space infections [14].
Osseous¶
Pediatric hands possess unique anatomical characteristics, specifically including open growth plates [27].
Vascular & Neural¶
The distal phalanx is supplied by a dual blood supply [15].
Classification¶
Chronic hand infections are uncommon and require a high index of suspicion for early diagnosis [12]. These infections are grouped by microorganism into bacterial (mycobacterial and others), fungal, and viral types [12].
Atypical Infections: These are difficult to recognize and treat due to their indolent nature and nonspecific symptoms [7]. Tularemia is a consideration for hand infections that persist, particularly in the context of an animal bite [16].
Clinical Presentation¶
Felon and paronychia represent the most common hand infections [8]. Hand infections generally exhibit variable presentations [18], and many straightforward cases can be clinically diagnosed and treated without further testing [18]. Diagnosis is primarily clinical [13], supported by a thorough medical history, clinical examination, and appropriate laboratory testing to determine proper disposition upon emergency department presentation [18]. Imaging and laboratory evaluations further aid in the diagnostic process [13].
A high index of suspicion, combined with excellent knowledge of hand anatomy and function, is required for the accurate diagnosis of deep space infections [14]. Clinicians must remain aware of obscure conditions that mimic common fingertip infections [6]. Atypical hand infections are characterized by an indolent nature and nonspecific symptoms [7].
Red-flag patterns and differential diagnoses: * Tularemia: Consider tularemia hand infection when a hand infection persists, particularly in the context of an animal bite [16]. Rare and dangerous infections caused by Francisella tularensis following a mouse bite require specialized workup to rule out in atypical cases [23]. * Taxane-related dystrophy: Acute felon is an unusual but aggressive manifestation of taxane-related nail dystrophy. This condition must be distinguished from chronic subungual abscesses in immunocompromised patients [19].
Investigations¶
Laboratory: Early identification through appropriate laboratory testing, paired with surgical treatment and medical management, is imperative for eradication of the causative organism in atypical hand infections [7]. Imaging and laboratory evaluation aid in the diagnosis of hand and upper-extremity infections [13].
Plain radiography: Early osteomyelitis of the bone can be detected long before the roentgenogram reveals evidences of destruction [26].
Other Considerations: A high index of suspicion coupled with an excellent knowledge of hand anatomy and function allows for an accurate diagnosis and effective management of deep space infections [14].
Treatment¶
Non-Operative¶
Antibiotic Stewardship: Antibiotics are not required in the postoperative phase following excision of uncomplicated paronychia and felon in patients who are not at risk [9]. There is no significant difference in infection rates in elective hand surgery whether antibiotics are administered preoperatively or not [29].
Operative¶
Indications: Clinicians must be directed in an evidence-based manner to recognize more obscure conditions that can mimic common infections and to understand the relevant anatomy of the fingertip [6]. Atypical hand infections are difficult to recognize and treat due to their indolent nature and nonspecific symptoms; early identification through appropriate laboratory testing and surgical treatment paired with medical management is imperative for eradication of the causative organism [7].
Surgical Approach / Technique: The management of felon is based entirely on tradition and expert opinion, with no primary data regarding management found in the literature [25]. Management of osteomyelitis of the hand and wrist should consist of a combined surgical and medical approach to achieve the most favorable outcome [11]. Osteomyelitis of the hand can have devastating effects on hand function if not adequately and promptly treated [2]. Early amputation to maximize disease-free survival may be appropriate for patients with hand osteomyelitis and arterial calcification [21].
Complications¶
Delayed Diagnosis: Delayed diagnosis of hand infections can result in amputation or death [1].
Surgical Approach Outcomes: The lateral-ungual approach with nail bed or finger pulp flap results in no wound infections or nail deformities [3].
Bone Regeneration: Removal of the major portion of the phalanx with preservation of the base can result in regeneration of the phalanx [15].
Recovery¶
Light activity (weeks): Evidence does not specify a timeline for light activity or return to desk work.
Full activity (months): Evidence does not specify a timeline for manual work, sport, or full range of motion and strength return.
Complete recovery / outcome plateau (months): Evidence does not specify a timeline for the stabilization of pain, strength, or final functional outcomes.
Rehabilitation protocol: Effective treatment of mucormycosis osteomyelitis of the hand is predicated upon prompt recognition, early aggressive debridement, and appropriate antimicrobial coverage [31].
Functional milestones: Removal of the major portion of the phalanx and preservation of the base will often give startling results in the regeneration of the phalanx [15].
Other Considerations: Effective treatment of mucormycosis osteomyelitis of the hand is predicated upon prompt recognition, early aggressive debridement, and appropriate antimicrobial coverage [31].
Key Evidence¶
- [L5] Early identification and treatment of hand infections are essential to achieve optimal outcomes, as delayed diagnosis can result in amputation or death. [1] (10.1016/j.jhsa.2018.05.027)
- [L5] Osteomyelitis of the hand is uncommon but can have devastating effects on hand function if not adequately and promptly treated. [2] (10.1177/1753193415612373)
- [L4] The lateral-ungual approach with nail bed or finger pulp flap allows full access to the subungual or finger pulp region without disturbing nail bed organization, resulting in significant pain improvement, normal function recovery in 3 weeks, and no wound infections or nail deformities. [3] (10.1177/1753193410397980)
- [L5] Hand infections are associated with a high rate of complications that are often difficult to manage. [4] (10.1016/j.hcl.2020.03.010)
- [L5] It is essential for emergency physicians to be familiar with the management of finger felons and paronychias. [5] (10.1016/j.jemermed.2025.07.054)
- [Paper] This review seeks to direct clinicians in an evidence-based manner, to make them aware of more obscure conditions that can mimic common infections, and to provide an understanding of the relevant anatomy of the fingertip. [6] (10.1016/j.hcl.2020.03.004)
- [L4] Atypical hand infections are difficult to recognize and treat due to their indolent nature and nonspecific symptoms; early identification through appropriate laboratory testing and surgical treatment paired with medical management is imperative for eradication of the causative organism. [7] (10.1016/j.jhsa.2025.09.023)
- [L5] Paronychias and felons are the most common hand infections. [8] (10.1016/s0749-0712(21)00416-9)
- [L2] The findings confirm that antibiotics are not needed in the postoperative phase after excision of uncomplicated paronychia and felon in patients who are not at risk. [9] (10.1016/j.hansur.2015.12.003)
- [L5] Hand infections include a diverse array of entities with potential for serious morbidity. [10] (10.1016/j.jhsa.2011.05.035)
- [L5] Management of osteomyelitis of the hand and wrist should consist of a combined surgical and medical approach to achieve the most favorable outcome. [11] (10.1016/j.jhsa.2009.03.020)
- [L5] Chronic hand infections are uncommon and require a high index of suspicion for early diagnosis; they are grouped by microorganism into bacterial (mycobacterial and others), fungal, and viral types, with specific presentations and treatments emphasized for each. [12] (10.1016/j.jhsa.2014.04.003)
- [L5] Hand and upper-extremity infections are usually a clinical diagnosis, but imaging and laboratory evaluation aid in diagnosis. [13] (10.1016/j.hcl.2020.03.002)
- [L5] A high index of suspicion coupled with an excellent knowledge of hand anatomy and function allows for an accurate diagnosis and effective management of deep space infections. [14] (10.1016/j.hcl.2020.03.014)
- [L4] The distal phalanx has a dual blood supply, and removal of the major portion of the phalanx and preservation of the base will often give startling results in the regeneration of the phalanx. [15] (10.1001/archsurg.1942.01210240092006)
- [Case_report] The purpose of this case study is to alert treating providers to consider tularemia infection when a hand infection persists, particularly in the context of an animal bite. [16] (10.1016/j.jhsg.2020.07.001)
- [L3] [18] (10.1186/s13018-023-03911-5)
- [Case_report] Acute felon is an unusual but aggressive manifestation of taxane-related nail dystrophy that must be distinguished from chronic subungual abscesses in immunocompromised patients. [19] (10.1007/s11552-007-9029-3)
- [L4] Early amputation to maximize disease-free survival may be appropriate for patients with hand osteomyelitis and arterial calcification. [21] (10.1177/1753193420981871)
- [L4] This rare and dangerous infection should be considered in atypical cases of bites and has to be ruled out by specialized work up. [23] (10.1177/1753193418769023)
- [L5] The management of felon is based entirely on tradition and expert opinion, with no primary data regarding management found in the literature. [25] (10.1016/j.jhsa.2012.08.002)
- [L4] Early osteomyelitis of the bone can be detected long before the roentgenogram reveals evidences of destruction. [26] (10.1097/00000658-194001000-00013)
- [L5] Although many management principles are the same in pediatric and adult patients, physicians should bear in mind the unique environments and characteristics of the pediatric hand, including the frequency of fingers in mouths, open growth plates, and typically more robust circulation with fewer systemic comorbidities. [27] (10.1016/j.hcl.2020.03.012)
- [L2] Our prospective multicenter trial showed no significant difference in infection rate in elective hand surgery whether antibiotics were administered preoperatively or not. [29] (10.1177/1558944719842238)
- [L4] Effective treatment is predicated upon prompt recognition, early aggressive debridement, and appropriate antimicrobial coverage. [31] (10.1016/j.jhsa.2018.04.034)
See Also¶
References¶
[1] Hand Infections. The Journal of Hand Surgery. 2019. DOI: 10.1016/j.jhsa.2018.05.027
[2] Osteomyelitis of the hand. Journal of Hand Surgery (European Volume). 2015. DOI: 10.1177/1753193415612373
[3] The treatment of finger glomus tumours by raising a full thickness nail bed flap or finger pulp flap. Journal of Hand Surgery (European Volume). 2011. DOI: 10.1177/1753193410397980
[4] Complications of Hand Infections. Hand Clinics. 2020. DOI: 10.1016/j.hcl.2020.03.010
[5] Management of Finger Felons and Paronychia: A Narrative Review. The Journal of Emergency Medicine. 2025. DOI: 10.1016/j.jemermed.2025.07.054
[6] Fingertip Infections. Hand Clinics. 2020. DOI: 10.1016/j.hcl.2020.03.004
[7] Atypical Hand Infections. The Journal of Hand Surgery. 2026. DOI: 10.1016/j.jhsa.2025.09.023
[8] INFECTIONS OF THE FINGERTIP. Hand Clinics. 1998. DOI: 10.1016/s0749-0712(21)00416-9
[9] Acute felon and paronychia: Antibiotics not necessary after surgical treatment. Prospective study of 46 patients. Hand Surgery and Rehabilitation. 2016. DOI: 10.1016/j.hansur.2015.12.003
[10] Hand Infections. The Journal of Hand Surgery. 2011. DOI: 10.1016/j.jhsa.2011.05.035
[11] Current Recommendations in the Management of Osteomyelitis of the Hand and Wrist. The Journal of Hand Surgery. 2009. DOI: 10.1016/j.jhsa.2009.03.020
[12] Chronic Hand Infections. The Journal of Hand Surgery. 2014. DOI: 10.1016/j.jhsa.2014.04.003
[13] Imaging and Laboratory Workup for Hand Infections. Hand Clinics. 2020. DOI: 10.1016/j.hcl.2020.03.002
[14] Hand Abscesses. Hand Clinics. 2020. DOI: 10.1016/j.hcl.2020.03.014
[15] END RESULTS OF A NEW INCISION FOR FELON (INFECTION OF THE ANTERIOR SPACE). Archives of Surgery. 1942. DOI: 10.1001/archsurg.1942.01210240092006
[16] Tularemia Hand Infection From a Cat Bite—A Case Report. Journal of Hand Surgery Global Online. 2020. DOI: 10.1016/j.jhsg.2020.07.001
[18] Renal disease and diabetes increase the risk of failed outpatient management of cellulitic hand infections: a retrospective cohort study. Journal of Orthopaedic Surgery and Research. 2023. DOI: 10.1186/s13018-023-03911-5
[19] Acute Felon as a Complication of Systemic Paclitaxel Therapy: Case Report and Review of the Literature. HAND. 2007. DOI: 10.1007/s11552-007-9029-3
[21] Hand osteomyelitis in arterial calcification, diabetes mellitus and end-stage renal failure: a comparison of 210 cases over 12 years. Journal of Hand Surgery (European Volume). 2021. DOI: 10.1177/1753193420981871
[23] A rare and dangerous hand infection caused by Francisella tularensis after a mouse bite. Journal of Hand Surgery (European Volume). 2018. DOI: 10.1177/1753193418769023
[25] Diagnosis and Management of the Acute Felon: Evidence-Based Review. The Journal of Hand Surgery. 2012. DOI: 10.1016/j.jhsa.2012.08.002
[26] NEW INCISION FOR CLOSED SPACE INFECTION (FELON) INVOLVING DISTAL PHALANX OF FINGER. Annals of Surgery. 1940. DOI: 10.1097/00000658-194001000-00013
[27] Pediatric Hand Infections. Hand Clinics. 2020. DOI: 10.1016/j.hcl.2020.03.012
[29] Prospective Analysis of Hand Infection Rates in Elective Soft Tissue Procedures of the Hand: The Role of Preoperative Antibiotics. HAND. 2019. DOI: 10.1177/1558944719842238
[31] Mucormycosis Osteomyelitis of the Hand. The Journal of Hand Surgery. 2019. DOI: 10.1016/j.jhsa.2018.04.034