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Paronychia (Infection Beside the Nail)

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Updated Oct 20266 citations
Illustration: Paronychia (Infection Beside the Nail)

What you're feeling

Paronychia means infection or inflammation in the skin fold beside your nail. It can come on fast or build up slowly, and the two forms feel different.

The fast form usually starts after a hangnail, a nail bite, or a small injury to the skin beside the nail. Within a day or two the fold becomes tender, swollen and red, and pus can collect under that fold. The pain is sharp and throbbing, and it sits right at the edge of the nail rather than further up the finger. Everyday tasks that press on the fingertip become hard: picking up coins, typing, doing up buttons, or gripping a kettle.

The slow form builds over six weeks or more. The swelling and redness are milder, but the fold stays sore and puffy. The skin fold can lift away from the nail, and the nail itself may develop ridges, grooves or changes in colour. It tends to flare after your hands have been wet for a while, so washing up, showering, or a day of damp work can set it off. Repeated wet work, frequent handwashing, or damage to the cuticle from manicuring can all keep it going. If it is not treated, painful flare-ups keep returning.

If the redness, swelling and pain spread up your finger, or you develop a fever, go to the emergency department the same day. You do not need a referral.

What's actually happening

Your nail sits in a snug pocket of skin. The fold of skin that frames the nail at its base and sides works like a gasket, sealing the nail down onto the finger and keeping water, dirt and germs out of the layers underneath. Paronychia is what happens when that seal breaks.

In the fast form, bacteria get in through a hangnail, a bite or a small cut beside the nail. The body sends in fluid and infection-fighting cells, and pus builds up in the closed pocket. Because the pocket cannot stretch much, the pressure is what gives you that sharp, throbbing pain right at the nail edge.

The slow form is different. It is not mainly an infection. It starts when the cuticle, the little seal at the nail base, is damaged by wet work, frequent handwashing, manicuring or an irritating substance. Once that seal is gone, water and irritants soak into the fold and the fold becomes inflamed. A swollen fold cannot press back down onto the nail, so it stays lifted and holds moisture, and germs settle in the damp gap. The yeast often found there is more of a passenger than a cause. The ongoing irritation also disturbs the layer under the cuticle that grows the nail, which is why ridges and grooves appear. Each flare keeps the seal from repairing, so the problem sustains itself.

If pus is left alone it can track under the nail or around to the other side of the finger.

What we can do about it

Dr Kieran Hirpara, an upper-limb surgeon at Mater Private Hospital Rockhampton, starts with the least invasive options that suit your condition. Patients are generally referred to our clinic by their GP; if a physiotherapist has suggested you see us, you will still need a referral from your GP in order to be eligible for the Medicare rebate. We assess your hand, examine the nail fold, and arrange imaging only if it is needed.

For the slow form, self-care comes first. Protecting the nail folds matters more than any cream: keep your hands dry, wear gloves for wet work, and stop picking or cutting the cuticle. We may prescribe a steroid cream or ointment that you rub into the fold, which calms the inflammation. Creams applied to the fold work better than tablets for this form. Give it several weeks, and keep up the dry-and-protected routine even once the skin settles, because the seal needs time to repair.

For the fast form with pus, we may prescribe antibiotic tablets, sometimes with warm salt-water soaks at home. The warmth can help a small collection of pus drain on its own. If pus has already built up under the fold, it usually needs to be released rather than left on antibiotics alone. Early treatment can settle things within a few days without removing any nail.

If the slow form has not settled after a fair trial of these measures, surgery is considered. The operation removes a crescent of the thickened, inflamed skin fold at the nail base, which lets the fold heal back down onto the nail and seal again. If the nail itself has become ridged or irregular, removing the nail plate at the same time improves the result. We will talk through whether surgery suits your finger and decide together.

What to expect

The fast form usually settles well when it is treated early. Many people are cured without any nail needing to be removed. Once the pus is released and the skin fold can heal, the pain eases and the finger returns to normal over days to weeks.

The slow form takes longer. It is a condition that comes and goes, flaring after wet work and settling when the fold is protected. With steady care, keeping the hands dry and the cuticle intact matters more than any cream, the gap between the skin fold and the nail fills in over 6 to 8 weeks and the seal repairs itself. Some people need several months of this routine before the fold settles for good. If it is left alone, painful flare-ups keep returning, and the nail can thicken and develop lasting ridges or grooves.

Surgery for the slow form removes the thickened fold so it can heal back down onto the nail. Fingers whose nail has stayed smooth generally heal with the fold surgery alone. Where the nail is already ridged or irregular, removing the nail plate at the same time gives a better chance the problem does not come back. Antibiotics are not usually needed after surgery for this condition in people without other health problems.

A few things are worth knowing as you go. Hand infections can lead to complications that are awkward to manage, so it pays not to ignore a finger that is not improving. If your symptoms are not settling, are getting worse over weeks, wake you at night, or stop you working or using your hand, see your GP or ask for a specialist review.

When to see someone

Most nail fold infections settle with early care, but some signs mean you should not wait. Go to an emergency department the same day if your finger becomes hot, red, swollen and painful, especially with a fever, or if pus is spreading up the finger. You do not need a referral. Hand infections can lead to complications that are awkward to manage once they take hold, so same-day care matters.

See your GP if the soreness and swelling have lasted six weeks or more, or if the fold keeps flaring after wet work despite keeping it dry and protected. Ask for a specialist review if the skin fold stays lifted and puffy, the nail develops ridges or grooves, or a nail problem does not respond to creams. A nail fold that will not settle after proper treatment needs a closer look, because other causes are sometimes mistaken for this condition.

In more depth

Advanced reading: the deeper science (optional)

This section goes further than you need for your own treatment decisions. Paronychia is worth the extra reading because one word covers two conditions that behave differently, respond to opposite treatments, and are routinely confused, and because the surgical answer for the chronic form is older, simpler and better supported than most people expect.

Two conditions, one name

Acute paronychia is a bacterial infection of the nail fold, most often Staphylococcus aureus, developing over 24 to 48 hours after the seal between nail and skin is breached [1]. It is red, hot, tense and disproportionately painful, and it forms pus.

Chronic paronychia, by convention lasting beyond six weeks, is not primarily an infection at all. It is an inflammatory dermatitis of the nail fold driven by repeated wet exposure and irritants, in which loss of the cuticle seal allows further irritant entry, producing a cycle that sustains itself [2]. Candida is frequently cultured from these folds, which is precisely why the condition was long treated as a fungal infection, but its presence is better understood as colonisation of an already-damaged fold than as the cause.

The trial that reframed the chronic form

The evidence that settles this is a randomised, double-blind, double-dummy trial comparing a topical steroid (methylprednisolone aceponate) against two systemic antifungals. Of 48 nails treated with the topical steroid, 41 were improved or cured, against 30 of 57 on terbinafine and 29 of 64 on itraconazole, a statistically significant advantage to the steroid [3].

The same trial contains the more decisive observation. Candida presence was not strictly linked to disease activity, and eradicating Candida was associated with clinical cure in only 2 of the 18 patients who carried it at baseline [3].

That is hard to reconcile with a fungal aetiology and easy to reconcile with an inflammatory one: the yeast is a passenger in a damaged fold, not the driver. It reframes the condition as a barrier problem: the cuticle is the seal, wet work destroys it, the fold swells, the swollen fold cannot re-seal, and organisms colonise the gap. Treating the colonisers leaves the mechanism untouched.

The practical corollary is unglamorous and is the part patients most often skip: the single most effective intervention is keeping the hands dry and out of irritants. Gloves outperform prescriptions here.

Acute paronychia: drainage, and how much to disturb

Once pus has formed, antibiotics alone will not clear it, the collection has to be released [1]. The traditional approach lifts the nail fold off the nail plate to decompress the abscess, removing part of the nail where pus has tracked beneath it.

A nail-preserving alternative is the Swiss roll technique, in which the nail fold is elevated and rolled back over a suture rather than incised or excised, held for a few days and then unrolled [4]. The attraction is that it drains a collection that has spread across the fold without sacrificing nail plate or nail fold, which matters where the alternative would be a wide incision.

The general principle across both is that the incision should decompress the fold rather than enter the pulp of the finger, since the pulp is a separate compartment and opening it converts a straightforward paronychia into a more troublesome wound.

Eponychial marsupialisation

For chronic paronychia that has not settled, the operation is one described in 1976 and essentially unchanged since.

Keyser and Eaton's procedure removes a crescent of the thickened proximal nail fold, taking the inflamed tissue while stopping short of the germinal matrix, and leaves the defect open to heal by contraction, which draws the fold back down onto the nail plate and restores the seal the disease destroyed [5].

The anatomy is what makes the margin critical. Beneath the cuticle sits a two-to-three-millimetre cul-de-sac of germinal matrix that produces the nail plate, and the subcutaneous layer over it governs the nail's surface. Disturb that layer, by infection, pressure or trauma, and nail production is deranged in proportion: brief episodes give transverse ridges, long-standing disease gives the longitudinal grooving and thickening that characterises chronic paronychia [5].

So sparing the germinal matrix is what prevents a permanent nail deformity, and leaving the wound open is what produces the contraction that reseals the fold, closing it would defeat the purpose.

The refinement that removed the recurrences

The most useful piece of outcome data is a small series with a clear internal comparison. As reported, fingers with nail irregularities treated by marsupialisation alone went on to recur in a minority of cases, whereas a subsequent group of fingers with nail irregularities treated by marsupialisation plus removal of the nail plate did not; fingers without nail irregularities healed with marsupialisation alone [6].

The series is small and sequential rather than randomised, so this is a signal rather than a proof — and the full text was not available to us, so the figures above are as summarised in the secondary literature rather than read from the paper. But it gives a concrete intraoperative rule: an irregular or ridged nail is evidence that the disease has already involved the matrix beneath, and in that finger the nail plate should come off as well. A normal-looking nail can be left.

That is an unusually actionable finding for a condition this common, and it is the reason the state of the nail plate, not just the fold, is worth examining before deciding on the operation.

Reviewed by AI synthesis (v2) — pending human review · 19 August 2026.

Want the clinical detail? Read the clinician version.

Talk to your treating clinician for advice specific to you.

For an appointment with the CQ Hand + Upper Limb team, ask your GP about a referral or visit www.cqupperlimb.com.

References for the advanced reading
  1. Ritting AW, O'Malley MP, Rodner CM. Acute paronychia. J Hand Surg Am. 2012;37(5):1068-70.
  2. Shafritz AB, Coppage JM. Acute and chronic paronychia of the hand. J Am Acad Orthop Surg. 2014;22(3):165-74.
  3. Tosti A, Piraccini BM, Ghetti E, Colombo MD. Topical steroids versus systemic antifungals in the treatment of chronic paronychia: an open, randomized double-blind and double dummy study. J Am Acad Dermatol. 2002;47(1):73-6.
  4. Pabari A, Iyer S, Khoo CTK. Swiss roll technique for treatment of paronychia. Tech Hand Up Extrem Surg. 2011;15(2):75-7.
  5. Keyser JJ, Eaton RG. Surgical cure of chronic paronychia by eponychial marsupialization. Plast Reconstr Surg. 1976;58(1):66-70.
  6. Bednar MS, Lane LB. Eponychial marsupialization and nail removal for surgical treatment of chronic paronychia. J Hand Surg Am. 1991;16(2):314-7.
Evidence & references

This is the clinical evidence summary written for health professionals. It is technical, and it lists the research this page was built from. You do not need to read it to understand your treatment or to make a decision about it.

Overview

  • In chronic paronychia, C. albicans involvement was found in the outer epidermis with mycelium, but without involvement of the dermis [1].
  • Candida albicans was recovered in approximately 15% of paronychia cases [3].
  • Untreated paronychial infection can cross the eponychium to the contralateral paronychial fold, course anteriorly into the pulp tissue, and decompress into the periosteum and distal tuft, causing osteomyelitis and necrosis [5].

Anatomy & Pathophysiology

Microbiology & Histopathology

  • In chronic paronychia, C. albicans involvement is present in the outer epidermis with mycelium, but there is no involvement of the dermis [1].

Surgical Anatomy & Pathology

  • In recalcitrant cases of chronic paronychia, surgical treatment may include en bloc excision of the proximal nail fold or eponychial marsupialization, with or without nail plate removal [2].

Clinical Presentation

  • Candida albicans was recovered in about 15% of paronychia cases [3].
  • In a patient with habitual nail biting, an untreated paronychial infection crossed the eponychium to the contralateral paronychial fold, coursed anteriorly into the pulp tissue, and decompressed into the periosteum and distal tuft, causing osteomyelitis and necrosis [5].

Investigations

  • In chronic paronychia, C. albicans involvement was found in the outer epidermis with mycelium, but no involvement of the dermis was observed [1].
  • A careful physical examination is essential to direct care and future testing, as diagnostic tests such as imaging and serum laboratory studies can be expensive, time-consuming, and often nonspecific [27].

Treatment

Operative

  • In recalcitrant cases of chronic paronychia, surgical treatment may include en bloc excision of the proximal nail fold [2].
  • In recalcitrant cases of chronic paronychia, surgical treatment may include eponychial marsupialization [2].
  • Surgical treatment for recalcitrant chronic paronychia may be performed with or without nail plate removal [2].
  • The eponychial folding flap demonstrated statistically superior outcomes in terms of apparent nail-plate exposure compared to rectangle recession after fingertip amputation [15].
  • The mean difference in apparent nail-plate exposure between the eponychial folding flap and rectangle recession was 0.61 mm (95% CI, 0.35—0.87 mm; P < .001) [15].
  • The eponychial folding flap demonstrated statistically superior aesthetic satisfaction compared to rectangle recession after fingertip amputation [15].
  • The eponychial folding flap demonstrated statistically superior postoperative pain outcomes compared to rectangle recession after fingertip amputation [15].
  • The application of the eponychial flap allowed a nail lengthening ranging from 28.5 to 80% of the exposed nail body [9].

Non-Operative

  • In chronic paronychia, C. albicans involvement is present in the outer epidermis with mycelium [1].
  • In chronic paronychia, C. albicans involvement does not extend to the dermis [1].
  • The nail should be retained whenever possible because it can be used as a splint and simultaneous waterproof dressing in many finger tip injuries [12].
  • Retaining the nail eliminates most of the pain attributable to exposure of the nail bed in many cases [12].

Complications

  • In recalcitrant cases of chronic paronychia, surgical treatment may include en bloc excision of the proximal nail fold or an eponychial marsupialization, with or without nail plate removal [2].

Recovery

  • The eponychial folding flap demonstrated statistically superior outcomes in terms of apparent nail-plate exposure compared to rectangle recession, with a mean difference of 0.61 mm (95% CI, 0.35—0.87 mm; P < .001) [15].
  • The eponychial folding flap demonstrated statistically superior outcomes in terms of aesthetic satisfaction compared to rectangle recession [15].
  • The eponychial folding flap demonstrated statistically superior outcomes in terms of postoperative pain compared to rectangle recession [15].

Key Evidence

  • [L4] Each lesion studied had C. albicans involvement with mycelium in the outer epidermis but no involvement of the dermis. [1] (10.1001/archderm.1962.01590090066015)
  • [L4] In recalcitrant cases, surgical treatment may be resorted to, which includes en bloc excision of the proximal nail fold or an eponychial marsupialization, with or without nail plate removal. [2] (10.4103/0019-5154.123482)
  • [L4] Candida albicans was recovered in about 15% of the cases. [3] (10.1016/0266-7681(93)90063-l)
  • [L5] This patient with habitual nail biting developed a paronychial infection, which untreated, crossed the eponychium to the contralateral paronychial fold, coursed anteriorly into the pulp tissue, and finally decompressed into the periosteum and distal tuft, causing osteomyelitis and necrosis. [5] (10.1016/s0363-5023(05)80062-0)
  • [L4] The application of the eponychial flap allowed a nail lengthening ranging from 28.5 to 80% of the exposed nail body. [9] (10.1016/s0363-5023(03)80451-3)
  • [L5] The nail should be retained whenever possible because it can be used as a splint and simultaneous waterproof dressing in many finger tip injuries, and in many cases eliminates most of the pain attributable to exposure of the nail bed. [12] (10.1016/s0266-7681(84)80030-3)
  • [L4] The eponychial folding flap demonstrated statistically superior outcomes in terms of apparent nail-plate exposure (mean difference 0.61 mm; 95% CI, 0.35—0.87 mm; P < .001), aesthetic satisfaction, and postoperative pain, without compromising scar quality or functional recovery. [15] (10.1016/j.jhsg.2026.101101)

References

[1] Chronic Paronychia. Archives of Dermatology. 1962. DOI: 10.1001/archderm.1962.01590090066015

[2] Management of chronic paronychia. Indian Journal of Dermatology. 2014. DOI: 10.4103/0019-5154.123482

[3] Paronychia: a Mixed Infection. Journal of Hand Surgery. 1993. DOI: 10.1016/0266-7681(93)90063-l

[5] Eikenella osteomyelitis in a chronic nail biter: A case report. The Journal of Hand Surgery. 1995. DOI: 10.1016/s0363-5023(05)80062-0

[9] The eponychial flap: A new technique to restore the length of a short nail. The Journal of Hand Surgery. 2003. DOI: 10.1016/s0363-5023(03)80451-3

[12] The Best Dressing for a Nail Bed is the Nail Itself. Journal of Hand Surgery. 1984. DOI: 10.1016/s0266-7681(84)80030-3

[15] Comparative Outcomes of Rectangle Recession Versus Eponychial Folding Flaps for Nail-Plate Length After Fingertip Amputation. Journal of Hand Surgery Global Online. 2026. DOI: 10.1016/j.jhsg.2026.101101

[27] Orthopaedic Knowledge Update 13 Ebook Without Multimedia. Anatomy, Evaluation, Clinical Examination, and Imaging > Evaluation and Clinical Examination: Current Concepts.

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d. Sections 1, 5, 6, 7, and 8 survive termination of this Public License.

Section 7 -- Other Terms and Conditions.

a. The Licensor shall not be bound by any additional or different terms or conditions communicated by You unless expressly agreed.

b. Any arrangements, understandings, or agreements regarding the Licensed Material not stated herein are separate from and independent of the terms and conditions of this Public License.

Section 8 -- Interpretation.

a. For the avoidance of doubt, this Public License does not, and shall not be interpreted to, reduce, limit, restrict, or impose conditions on any use of the Licensed Material that could lawfully be made without permission under this Public License.

b. To the extent possible, if any provision of this Public License is deemed unenforceable, it shall be automatically reformed to the minimum extent necessary to make it enforceable. If the provision cannot be reformed, it shall be severed from this Public License without affecting the enforceability of the remaining terms and conditions.

c. No term or condition of this Public License will be waived and no failure to comply consented to unless expressly agreed to by the Licensor.

d. Nothing in this Public License constitutes or may be interpreted as a limitation upon, or waiver of, any privileges and immunities that apply to the Licensor or You, including from the legal processes of any jurisdiction or authority.

Creative Commons is not a party to its public licenses. Notwithstanding, Creative Commons may elect to apply one of its public licenses to material it publishes and in those instances will be considered the “Licensor.” The text of the Creative Commons public licenses is dedicated to the public domain under the CC0 Public Domain Dedication. Except for the limited purpose of indicating that material is shared under a Creative Commons public license or as otherwise permitted by the Creative Commons policies published at creativecommons.org/policies, Creative Commons does not authorize the use of the trademark "Creative Commons" or any other trademark or logo of Creative Commons without its prior written consent including, without limitation, in connection with any unauthorized modifications to any of its public licenses or any other arrangements, understandings, or agreements concerning use of licensed material. For the avoidance of doubt, this paragraph does not form part of the public licenses.

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