The Bottom Line
Paronychia is an infection of the skin alongside or underneath the nail. There are two very different types: acute paronychia develops suddenly and is usually caused by bacteria — it often needs drainage and possibly antibiotics. Chronic paronychia builds up slowly over months and is usually caused by yeast combined with skin barrier breakdown from repeated water exposure — so treatment focuses on keeping the area dry, not just using antifungals. Knowing which type you have is key, because the treatment is different for each.
What Is Paronychia?
Paronychia is an infection of the paronychium — the soft tissue that borders the nail on the sides and at the base. It can affect one finger or toe, or multiple digits. It is one of the most common hand infections seen in both primary care and dermatology offices.
The condition comes in two distinct forms: acute and chronic. They have different causes, different appearances, and different treatments — which is why it is important to distinguish between them.
Acute Paronychia: Sudden and Bacterial
Acute paronychia develops rapidly, usually over a day or two. The skin around the nail becomes red, swollen, warm, and very tender. You may notice a visible pocket of pus forming just under the skin near the nail fold. Common triggers include:
- Biting your nails or picking at the cuticles
- Cutting or pushing back the cuticles aggressively
- A splinter, thorn, or small cut near the nail
- Ingrown nail (especially on toes)
- Artificial nail application or removal
The most common bacteria involved are Staphylococcus aureus and Streptococcus species. In people who bite their nails, oral bacteria (including anaerobes) can also play a role.
Treatment: Mild cases often resolve with warm water soaks (10–15 minutes, 3–4 times daily) and topical antibiotics. If pus has formed, a dermatologist or urgent care provider will need to drain it with a small incision — this gives fast relief and is the most important step. Oral antibiotics (such as cephalexin or trimethoprim-sulfamethoxazole for suspected MRSA) are prescribed when the infection is spreading or not improving with drainage alone. Most acute cases resolve completely within 1–2 weeks with proper treatment.
Chronic Paronychia: Slow-Building and Yeast-Related
Chronic paronychia develops gradually over weeks to months. It is characterized by a puffy, tender, slightly red nail fold that comes and goes repeatedly. There is usually no obvious pus. Instead, the cuticle becomes detached or absent, leaving a small gap between the nail fold and nail plate. This gap allows moisture, irritants, and microbes to enter repeatedly.
The root cause is usually a two-part problem:
- Disrupted skin barrier — from repeated exposure to water, chemicals, or friction
- Colonization by yeast — usually Candida albicans, which takes advantage of the damaged, moist skin
Chronic paronychia is most common in people whose hands are frequently wet: bartenders, dishwashers, nurses, housekeepers, swimmers, and parents of young children who frequently wet their hands. It is also common in people with diabetes or those on certain medications (isotretinoin, retinoids, anti-cancer drugs like EGFR inhibitors). Women develop chronic paronychia more often than men.
Treatment: The single most important step is keeping the area dry. This means wearing waterproof gloves for wet tasks, avoiding nail biting, and stopping any habit that disrupts the cuticle. Topical antifungals (clotrimazole, miconazole) combined with a low-to-mid-strength topical corticosteroid (to reduce inflammation) are applied to the nail fold daily. Treatment typically continues for 3–4 months. Cases that do not respond may need short courses of oral antifungals or a minor surgical procedure to remove chronically inflamed nail fold tissue (eponychial marsupialization).
A Quick Comparison: Acute vs. Chronic
| Feature | Acute | Chronic |
|---|---|---|
| Onset | Hours to days | Weeks to months |
| Main cause | Bacteria (Staph, Strep) | Yeast + skin barrier damage |
| Pus present | Often yes | Usually no |
| Primary treatment | Drainage + antibiotics | Keep dry + topical antifungal/steroid |
| Who gets it | Nail biters, after injury | People with wet-work occupations |
Nail Changes With Chronic Paronychia
Over time, chronic paronychia changes the appearance of the nail itself. The nail may develop horizontal ridges (Beau's lines) — lines that run across the width of the nail. This happens because repeated inflammation at the nail base temporarily disrupts nail growth. Multiple ridges may appear, one for each flare. The nail may also become discolored (green-black), especially if Pseudomonas bacteria get into the space between the nail and nail fold. With successful treatment, these nail changes gradually resolve as new nail grows in.
When to See a Dermatologist
- The nail fold is red, swollen, and painful and is not improving with home soaks after 1–2 days
- There is obvious pus that needs to be drained
- The infection seems to be spreading up the finger (red streaks, increasing warmth)
- You have recurrent paronychia affecting the same finger repeatedly
- You have diabetes or a weakened immune system
- The problem has lasted more than 6 weeks (likely chronic paronychia requiring specific treatment)
Frequently Asked Questions
Can I drain a paronychia at home?
Warm soaks may encourage a small early collection to drain on its own, which is fine. However, you should not attempt to lance or cut the nail fold yourself. Improper drainage can spread the infection deeper or cause scarring. If there is significant pus, see a provider for safe, proper drainage.
Will my nail fall off with paronychia?
Nails do not usually fall off from paronychia unless the infection becomes very severe and spreads beneath the nail (subungual abscess). Chronic paronychia can cause the nail to become ridged or discolored, but with treatment the nail recovers as healthy new nail grows in.
I wash my hands constantly — why do I keep getting chronic paronychia?
Ironically, over-washing is part of the problem. Repeated wet-dry cycles damage the cuticle and the skin barrier around the nail. The key is protecting the skin: wear gloves for wet tasks, moisturize the hands after washing, and avoid disrupting the cuticle.
Do I need an antifungal or an antibiotic?
It depends on the type. Acute paronychia usually needs an antibiotic (it is bacterial). Chronic paronychia usually needs an antifungal plus a topical steroid (it is yeast-related with inflammation). Using the wrong treatment is why many people cycle through treatments without getting better — which is why seeing a dermatologist for the correct diagnosis is so important.
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Trusted Resources
Always consult a board-certified dermatologist for diagnosis and personalized treatment recommendations. This article is for educational purposes only.