Hand & Wrist

Paronychia and Felon

Nail fold and fingertip infections are common but should not be ignored, since a felon can progress quickly if left untreated. Dr. Peter FitzGibbons provides prompt evaluation and drainage for patients in Bethesda, Germantown, and throughout Montgomery County.

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What is paronychia and felon?

Paronychia is an infection of the skin folds around the fingernail; felon is a deeper, closed-space infection of the fingertip pad. Both usually follow minor trauma and respond well to prompt drainage. Felon is more dangerous because pressure builds within the fingertip's internal compartments, risking bone infection or spread to the tendon sheath if untreated.

Paronychia and felon are both hand infections that commonly follow minor trauma, but they involve different anatomy and carry different levels of urgency.

Paronychia is an infection of the periungual soft tissue, the folds of skin that border the fingernail. It is classified as acute, meaning symptoms have been present for less than 6 weeks, or chronic, meaning symptoms have persisted longer than 6 weeks. This distinction matters clinically because the two forms are typically caused by different organisms and are managed differently (Relhan & Bansal, "Acute and Chronic Paronychia Revisited," PMC; Leggit, Am Fam Physician). Acute paronychia affects women roughly three times as often as men (Relhan & Bansal).

Felon is a different and more concerning problem: a closed-space infection of the fingertip pulp, the fleshy pad on the underside of the fingertip beyond the last knuckle. The pulp is divided internally by numerous fibrous septae, thin vertical strands of tissue running from the bone up to the skin, which create a series of small compartments that don't communicate freely with one another. This anatomy is exactly why a felon is dangerous. When infection develops inside the pulp, those septae prevent pus from draining or decompressing on its own, so pressure builds rapidly inside the closed compartments, producing intense pain and, if untreated, a process similar to compartment syndrome within the fingertip that can compromise blood supply to the area. Because the bone of the fingertip sits so close within this same closed space, an untreated felon carries a real risk of progressing to bone infection (osteomyelitis) of the fingertip, or spreading to the adjacent flexor tendon sheath or the nearest joint (Nardi et al., "Felon," StatPearls).

Symptoms — do you recognize these?

Paronychia and felon present differently because they involve different tissue.

Acute paronychia: sudden pain, redness, and swelling of the skin fold beside the nail, often with a visible pocket of pus that can be expressed
Chronic paronychia: intermittent swelling, tenderness, and drainage over weeks to months, often with ridging or discoloration of the nail itself from ongoing irritation
Felon: intense, throbbing pain confined to the fingertip pad, frequently out of proportion to how the finger looks early on, with progressive swelling, warmth, redness, and a tensely swollen feel to the pulp

If your entire finger becomes uniformly swollen, is held bent, and hurts significantly when straightened, or if you develop fever, this may indicate the infection has spread beyond the nail fold or fingertip into the tendon sheath, and you should call our office right away or go to an emergency room rather than waiting.

How we diagnose it

Both conditions are diagnosed through history and physical examination. X-rays are reserved for cases where we suspect a retained splinter or foreign body, underlying bone infection, or when the diagnosis is otherwise unclear (Nardi et al., StatPearls).

In any suspected finger infection, we actively check for Kanavel's signs, which suggest the infection has spread to the flexor tendon sheath, a distinct and more serious problem called pyogenic flexor tenosynovitis that can develop as a complication of an inadequately treated felon or paronychia. The four classic Kanavel signs are tenderness along the flexor tendon sheath, a flexed resting posture of the finger, fusiform ("sausage digit") swelling of the entire finger, and pain when the finger is passively straightened (Kennedy, Huang & Hanel, Clin Orthop Relat Res). It is important to understand that no single sign is reliably present in every case. In one series of 75 patients, fusiform swelling was present in 97 percent but flexor sheath tenderness in only 64 percent, and a separate series of 41 patients found all four signs present together in just 54 percent of confirmed cases. In other words, the absence of one or more Kanavel signs does not rule out flexor tenosynovitis, and we treat the overall clinical picture rather than relying on any single finding (Kennedy, Huang & Hanel, Clin Orthop Relat Res).

Treatment options

Treatment differs meaningfully between paronychia and felon, and between the acute and chronic forms of paronychia.

Warm soaks and antibiotics for early paronychia

Warm water soaks combined with a topical or oral antibiotic targeting staph and strep, used before a discrete pocket of pus has formed.

When used: Early, mild acute paronychia without a fluctuant collection.

Chronic paronychia medical management

Avoiding moisture and irritant exposure, topical steroids or antifungal medication given the frequent role of Candida in chronic cases, correcting zinc deficiency with supplementation when present, and adjusting a causative medication (certain cancer drugs are a recognized cause) when feasible.

When used: Chronic paronychia, defined as symptoms lasting more than 6 weeks, which is managed fundamentally differently than the acute form (Leggit, Am Fam Physician).

Recovery & rehabilitation

Both conditions generally do well when treated promptly. Acute paronychia treated with adequate drainage typically resolves without needing additional antibiotics in most cases (Leggit, Am Fam Physician). Chronic paronychia follows a slower course, often requiring weeks to months of consistent moisture avoidance and topical treatment, with surgery reserved for cases that don't improve.

Felon prognosis is excellent when drained promptly. The main driver of a poor outcome, bone infection, spread to the tendon sheath or nearby joint, or loss of tissue at the fingertip, is delayed diagnosis or delayed drainage, which underscores why prompt evaluation of a painful, swollen fingertip matters given the closed-compartment anatomy involved (Nardi et al., StatPearls). If Kanavel's signs are present and the infection has reached the tendon sheath, recovery takes longer and typically requires a period of hand therapy afterward to restore full finger motion.

Frequently Asked Questions

What's the difference between paronychia and a felon?

Paronychia is an infection of the skin fold along the side or base of the fingernail. A felon is a deeper infection inside the fleshy pad at the very tip of the finger, below the last joint. They can look similar early on, but a felon is more concerning because the fingertip pad is divided into small enclosed compartments by internal fibrous bands, so pressure builds up quickly inside it and the infection can spread to the bone or tendon sheath if it isn't drained promptly.

Do I need antibiotics after my paronychia is drained?

Often not, if the drainage is complete. Research on this specific question found that once a paronychial abscess is properly drained, routine oral antibiotics afterward usually don't add benefit, even in some cases caused by resistant staph bacteria. We decide case by case based on how extensive the infection is and whether there are signs it has spread beyond the immediate area.

How is chronic paronychia different from a one-time infection?

Chronic paronychia lasts more than 6 weeks and behaves differently than a typical acute infection. It's often driven by repeated moisture exposure, such as frequent hand-washing or wet work, and frequently involves a yeast called Candida rather than the bacteria typically responsible for acute cases. Some causes are correctable, including zinc deficiency and certain cancer medications known to cause this problem. Treatment focuses on avoiding moisture and irritants and using topical medication rather than antibiotics alone, and surgery is reserved for cases that don't respond.

What are Kanavel's signs and why do they matter?

Kanavel's signs are four physical exam findings that suggest an infection has spread into the flexor tendon sheath, a surgical emergency called pyogenic flexor tenosynovitis. They are tenderness along the tendon sheath, a bent resting posture of the finger, uniform swelling of the whole finger, and pain when the finger is straightened. Importantly, research shows that not every sign is present in every confirmed case, sometimes only about half of patients have all four together, so we don't rule out this diagnosis just because one sign is missing.

Can a felon go away on its own without being drained?

Once a felon has progressed to a defined pocket of pus, no. The fingertip pad's internal compartments prevent pus from draining on its own the way a more open infection might, so pressure keeps building. Very early cellulitis without a defined collection may occasionally be tried on oral antibiotics with close follow-up, but if it doesn't rapidly improve, or if pus has already formed, surgical drainage is necessary to relieve the pressure and prevent complications like bone infection.

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Peter G. Fitzgibbons, MD

Hand Surgery · Orthopedic Surgery

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Medically reviewed by Peter G. Fitzgibbons, MD, MD

Last reviewed August 5, 2026