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Beside the Nail, or In the Pad? They’re Different Infections With Different Deadlines.
Red, swollen and sore beside the nail is a paronychia. With no pus collected, warm soaks 3 to 4 times a day usually settle it within a few days to a week; see a doctor if it isn’t clearly better in 2 to 3 days. A tense, throbbing fingertip pad is a felon: see a doctor today, because it usually needs draining. Spreading redness, fever, or a whole swollen finger that won’t straighten: go to the ER now.
Two finger infections account for most of what walks into a clinic, and people routinely mix them up.
- Paronychia sits at the edge of the nail. Red, swollen, sore along the nail fold, sometimes with a bead of pus you can see under the skin.
- A felon sits in the pulp of the fingertip, the fleshy pad you tap a screen with. Tense, throbbing, and out of all proportion to how it looks.
The distinction matters because a paronychia often settles with soaks and time, and a felon almost never does. A felon left alone eats into the bone underneath.
Treat a felon like a paronychia and you’ve lost the days that mattered. That’s the whole reason to know which one you’ve got.
Paronychia or felon: which one do I have?
Look at WHERE it’s swollen, then at how it hurts.
- Swelling along the nail fold, the rest of the pad soft: paronychia.
- The whole fingertip pad tense, shiny and throbbing, the nail fold normal: felon.
- Small clear or cloudy blisters on the fingertip, burning or tingling first: possibly herpetic whitlow, a viral infection. This one should NOT be cut open. Get it looked at rather than squeezing it.
- The whole finger evenly swollen, resting bent, agony to straighten: neither of these. That’s a possible flexor tendon sheath infection, and it’s the ER tonight.
Paronychia: the one at the nail fold
It starts with a breach in the seal between nail and skin. A hangnail pulled off. Nail biting. An aggressive manicure. A picked cuticle.
Bacteria get in, and within a day or two the fold beside the nail is red, puffy and tender.
The question that decides treatment: is there pus collected, or is it just inflamed?
So what do you do?
Press gently along the fold. A soft, boggy area with a visible yellow-white collection under the skin is an abscess, and abscesses do not resolve with antibiotics alone. They need draining, which is a small procedure and gives near-immediate relief.
(Do not try to drain it yourself with a needle from the kitchen drawer. I’ve seen what that turns into, and the thing it turns into is the article I wrote about tendon sheath infections.)
Can I treat a paronychia at home?
If it’s firm, red and tender with no visible collection, early treatment is genuinely simple. In Closing Window terms, this window is still OPEN: time and soaks are on your side for a few days.
- Warm soaks. Comfortably warm water, 10 to 15 minutes, 3 to 4 times a day. Dry the finger well afterwards.
- Keep it out of water otherwise. Gloves for dishes and wet work. A soggy nail fold stays infected.
- Hands off. No picking, no biting, no pushing the cuticle back.
- Cover it lightly if it’s catching on things, but let it breathe.
- Watch the clock. If it isn’t clearly better in 2 to 3 days, or it’s spreading, see a doctor. Antibiotics may be needed, or it may have collected.
How long does a paronychia take to heal?
- Early, no pus, soaks: usually settling within a few days, gone within about a week.
- Drained: relief is immediate, dressings for a few days, and the finger is usually back to normal within 1 to 2 weeks.
- If the nail was involved: a ridge or a temporary nail deformity can grow out over the following months. A fingernail takes around 4 to 6 months to grow out fully, so that’s the honest timeline for the nail looking normal again.
Chronic paronychia: the one that keeps coming back
If the nail fold has been mildly swollen, boggy and unhappy for months rather than days, often across several fingers, that’s chronic paronychia and it’s usually not a straightforward bacterial infection. It belongs to people whose hands are wet all day: chefs, cleaners, bar staff, nurses, parents of small children.
Antibiotics generally don’t fix it. Keeping hands dry, gloves for wet work (cotton liners under rubber gloves help), and treatment aimed at yeast and inflammation rather than bacteria is the usual direction. It takes weeks to months, and it comes back if the wet work doesn’t change.
If you keep getting finger infections, acute or chronic, ask your doctor to check your blood sugar. See the diabetic hand.
Felon: the one in the fingertip pad
This one deserves more respect than it gets, because of how the fingertip is built.
The pulp of your fingertip isn’t a simple bag of fat. It’s divided into many small compartments by fibrous walls running from the bone to the skin, which is what gives your fingertip its firm, stable feel when you pinch.
Get an infection inside those compartments and the pus has nowhere to expand. Pressure builds fast in a closed space, which does two things: it produces pain far worse than the appearance suggests, and it squeezes shut the small vessels feeding the tissue and the bone.
A paronychia hurts. A felon throbs so hard it keeps you awake and you can feel your pulse in it. That difference is pressure, and pressure is the reason it needs draining rather than waiting.
Signs:
- Tense. The whole pad of the fingertip is swollen and tight.
- Shiny and hot. The skin over the pad looks stretched.
- Exquisitely painful to any touch. Often throbbing at night.
The rest of the finger is usually normal, which is what separates it from a tendon sheath infection.
Left untreated it can progress to infection of the bone in the fingertip, death of the skin over the pad, or spread into the tendon sheath. These aren’t rare enough to gamble on, which is why hand surgeons drain felons promptly rather than trying antibiotics alone and waiting. Here the window is CLOSING within days, not weeks.
How a felon is diagnosed and treated
- Examination usually makes the diagnosis: a tense, tender pad with a normal nail fold.
- X-ray if it’s been going for several days, or if something went in (a splinter, a thorn, glass), to check the bone and look for a foreign body.
- Drainage. Under a local anesthetic, a small incision releases the pus and the pressure. The cut is placed to avoid the most sensitive part of the pad where possible.
- Antibiotics alongside, as decided by your doctor or surgeon.
- Dressings and elevation for the first days.
Recovery after a felon is drained
Expect a couple of weeks of dressings and a fingertip that stays sensitive for considerably longer.
That’s the part people aren’t warned about.
The fingertip is one of the most densely innervated pieces of skin on your body. After an infection and an incision through it, the pad can stay hypersensitive, oddly numb in patches, or both, for months. Pinching, typing and buttons can be genuinely uncomfortable well after the wound has healed.
- Days 1 to 3: hand above heart level, dressing changes as instructed, gentle full bend and straighten of the finger 10 times every hour or two while awake so the end joint doesn’t stiffen.
- Weeks 1 to 2: wound closing. Light use around the dressing. A fingertip protector splint helps if the pad is catching on everything.
- Weeks 2 to 6: once the wound is closed, start desensitization and scar massage. Use the finger on purpose.
- Months 2 to 6: sensitivity usually keeps easing. A small firm scar in the pad can take a few months to soften.
Exercises for a sensitive fingertip after infection
This responds well to desensitization work. Protecting a sensitive fingertip is the reliable way to keep it sensitive.
- Texture ladder. Pick 4 or 5 textures from soft to rough: cotton wool, a silk scarf, a towel, the rough side of velcro. Rub the pad over the one you can just tolerate for 2 to 3 minutes. 3 to 5 times a day. Move up a texture when it stops bothering you.
- Tapping. Tap the pad gently on a table, then a firmer surface, 1 to 2 minutes at a time, a few times a day.
- Immersion. Push the fingertip into a bowl of dry rice or lentils, stir for 2 to 3 minutes. Then try firmer beans.
- Scar massage once healed: firm small circles over the scar, a few minutes, 2 to 3 times a day.
- Use it. Type, button, pinch with that finger rather than skipping it. Avoidance teaches the nervous system the finger is in danger.
If the fingertip is still very painful months after it has healed, read why your hand still hurts after it healed.
When can I work and use my hand normally?
- Paronychia, not drained: most people keep working. Gloves for any wet work.
- Paronychia, drained: desk work usually the next day or two. Wet work once the skin has sealed, often within a week, with gloves.
- Felon, drained: desk work often within a few days, typing around the dressing. Wet, dirty or heavy manual work usually waits until the wound has closed, often 2 to 3 weeks.
- Driving: once you can grip the wheel firmly and safely. Usually not the limiting factor here.
Who needs a lower threshold
Diabetes, immune-suppressing medicine including biologics and long-term steroids, chemotherapy, and poor circulation. In these groups the usual warning signs can be muted while the infection moves. A finger infection that would be “watch it for two days” in someone else is “be seen today” for you.
Get it checked today if
Go to the ER now if:
- The whole finger is swelling, not just one part, and it hurts badly to straighten. That’s the tendon sheath, and it’s an emergency.
- Redness is spreading up the finger or into the hand, or you can see a red line tracking up the arm.
- You have a fever of 38°C (100.4°F) or higher, shivering, or feel properly unwell. See cellulitis or septic arthritis.
- The infection followed a bite, human or animal, and it’s red, swollen or stiff. Bites to the hand behave differently and badly.
See a doctor today if:
- The fingertip pad is tense, throbbing and keeping you awake.
- There’s a visible collection of pus at the nail fold.
- You’re diabetic, immunosuppressed, or on chemotherapy and a finger is red and swollen.
- A paronychia isn’t clearly better after 2 to 3 days of soaks.
- You’re on antibiotics and it isn’t clearly better at 48 hours.
Get it checked if:
- The nail fold has been swollen and sore for weeks, or it keeps coming back.
- After a drainage, the wound isn’t closing by 2 to 3 weeks. See normal wound healing or infection.
Beside the nail, you usually have days. In the pad, you have less. Whole finger swollen, you have tonight.
Written by Nigel Chua, hand occupational therapist in practice since 2005. Thousands of hands, wrists and elbows assessed and treated. My credentials are here. This article explains; it doesn’t examine. Spreading redness, fever, or a finger infection in someone with diabetes needs seeing the same day.
Every article on this site is written using the Closing Window Method: name the window your condition runs on, find where you are in it, and act while it’s still open.