Paronychia: symptoms, treatment, and when to worry
Last updated September 3, 2026.
Paronychia is an infection of the skin fold beside a fingernail or toenail, causing redness, swelling, pain, and often a pocket of pus. The acute version follows a break in the skin, a bitten hangnail, aggressive manicuring, a splinter, and comes on over days. The chronic version, lasting weeks, is a different beast driven by repeated wet work and irritants, often with yeast involved.
Acute versus chronic
Acute paronychia: sudden, throbbing, red swelling at the nail edge, sometimes with visible pus, usually one finger, usually after minor trauma. Chronic paronychia: the nail fold stays swollen, tender, and rounded for six weeks or more, the cuticle disappears, several fingers may be involved, and the nail can become ridged and discolored. Chronic cases cluster in people whose hands are constantly wet: cleaners, dishwashers, bartenders, healthcare workers, and in thumb-sucking children.
What actually helps?
- Warm soaks for early acute cases: soaking the finger in warm water for 10 to 15 minutes, several times a day, settles early infections before pus forms.
- Drainage when pus collects: a visible pus pocket needs a clinician to release it, a quick procedure with rapid relief. Do not lance it yourself; home attempts push infection deeper.
- Antibiotics when spreading: oral antibiotics enter when redness spreads beyond the fold or soaks have failed.
- Chronic cases need dryness, not antibiotics: the treatment is keeping hands dry, gloves for wet work, emollients, and prescribed steroid or antifungal creams, over weeks. Avoiding the irritant is the cure; creams are the support.
- Stop the cause: nail biting, cuticle picking, and aggressive manicures are the usual entry points, and ending them ends the recurrences.
When is it an emergency?
Most paronychia is routine, but hand infections can spread fast: get same-day care for redness tracking up the finger or hand, red streaks up the arm, fever, severe throbbing pain, inability to bend the finger, or any infection in someone with diabetes or poor immunity. A deep pulp-space infection (felon) and tendon-sheath infection are surgical problems, and the escalation signs above are how they announce. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
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Common questions
Should I pop a paronychia myself?
No. Squeezing or lancing at home pushes bacteria deeper into the finger and can seed a pulp-space or tendon-sheath infection, which are surgical problems. A visible pus pocket is drained by a clinician with sterile technique, often with instant relief, and that quick visit is worth it. Before pus forms, warm soaks several times daily are the safe home move, and they genuinely settle many early infections.
How do I treat paronychia at home?
For early acute paronychia without pus: warm water soaks, 10 to 15 minutes, three or four times a day, then keep the finger dry between soaks. Take the ring off that finger, keep the hand raised when it throbs, and use simple pain relief. The boundaries: if pus appears, if pain and swelling escalate, or if two or three days of soaking bring no improvement, it is a clinic visit, not more soaking.
Why does my paronychia keep coming back?
Recurrence means an unbroken habit or exposure: nail biting, cuticle picking, or manicures that breach the seal between nail and skin. When it lasts beyond six weeks it is chronic paronychia, usually driven by constant wet exposure plus yeast rather than bacteria, and the treatment shifts to keeping hands dry, glove use for wet work, and prescribed steroid or antifungal creams over weeks, not antibiotics.
Is paronychia contagious?
The infection itself does not pass person to person in any meaningful way: it enters through your own broken skin from your own bacteria, typically staph from the skin or mouth flora in nail biters. No isolation, no worry about towels beyond ordinary hygiene. The contagious-sounding cousin is herpetic whitlow, a viral blistering infection of the finger that looks different, grouped clear blisters, and that one does spread by contact.
Can paronychia damage the nail?
Acute paronychia rarely does. Chronic paronychia can: the nail plate grows from beneath the inflamed fold, so weeks of inflammation produce ridging, thickening, discoloration, and distortion that resolve slowly after the inflammation is controlled, since nails grow out over months. Repeated severe acute episodes can also distort growth. Controlling the chronic inflammation is what restores a normal nail.
When does a finger infection become serious?
The escalation signs: redness spreading beyond the nail fold up the finger or hand, red streaks climbing the arm, fever, severe throbbing that disturbs sleep, a finger held bent and agonizing to straighten, or a tense, exquisitely tender fingertip pad. Those suggest deep-space or tendon-sheath infection, which are same-day surgical problems. Diabetes, poor immunity, and circulation problems lower the threshold for urgent review on any hand infection.