What Causes Paronychia?

Paronychia is generally an infectious condition affecting the nail and surrounding soft tissues. It may be caused by improper nail trimming, ill-fitting footwear, trauma, fungal infection, or bacterial infection. Prompt medical consultation is recommended to identify the underlying cause and initiate targeted treatment. A detailed analysis follows:

1. Improper Nail Trimming

Many individuals habitually trim their nails too short—particularly along the lateral nail folds—causing the nail edges to become embedded in adjacent soft tissue. As the nail grows, it continuously irritates the nail fold, triggering inflammation. To prevent this, nails should be trimmed correctly: avoid excessive shortening or rounding the corners; instead, cut them straight across, leaving the lateral corners slightly longer.

2. Ill-Fitting Footwear

Overly tight shoes exert compressive pressure on the toes, resulting in uneven stress on the toenails and potential deformation, as well as injury to the soft tissue of the nail fold. This creates favorable conditions for bacterial or fungal invasion, leading to paronychia. Opt for properly sized, spacious, and comfortable footwear; avoid high heels or excessively tight shoes. For existing inflammation, warm compresses and topical antiseptic treatments (e.g., magnesium sulfate solution soaks) may be applied.

3. Trauma

A clear history of injury—often accompanied by localized pain, swelling, and possibly bleeding or ecchymosis—can predispose to infection and subsequent inflammatory response in the nail fold. Wounds should be promptly cleaned and disinfected; if lacerated, suturing may be required. Prophylactic antibiotics (e.g., amoxicillin tablets), prescribed by a physician, may help prevent secondary infection.

4. Fungal Infection

Prolonged exposure to moist environments—especially on the feet—favors fungal growth, including *Candida albicans*. Fungal invasion of the nail fold and surrounding tissue induces inflammation and paronychia. Such infections frequently recur and are difficult to eradicate completely. Under medical supervision, topical or systemic antifungals—including terbinafine cream, ketoconazole cream, or itraconazole capsules—may be prescribed.

5. Bacterial Infection

Bacteria such as *Staphylococcus aureus* and *Streptococcus pyogenes* readily invade when the skin around the nail fold is compromised—for example, due to trauma or hangnails—resulting in infection and paronychia. Topical or oral antibacterials—such as fusidic acid cream, mupirocin ointment, or cefuroxime axetil tablets—may be prescribed per physician guidance.

Maintain healthy lifestyle habits: avoid spicy or irritating foods (e.g., Sichuan peppercorns, chili peppers, garlic), which may impede recovery.