Nail Scratch Infections: Risks, Symptoms & Prevention

Infection Risks from Nail Scratches

A nail scratch can introduce pathogens from the nail surface or skin into the dermis.

Potential Infections

Type	Pathogens	Presentation
Bacterial	Staph. aureus, Strep. pyogenes	Impetigo (honey crust), cellulitis (spreading redness), paronychia (nail fold abscess)
Viral	HSV-1/2	Herpetic whitlow (painful vesicles on finger)
Fungal	Dermatophytes (Trichophyton)	Tinea manuum (scaly, itchy), onychomycosis if nail invaded
Bloodborne	HBV, HCV, HIV	Rare via scratch; requires blood contact. Universal precautions.
Tetanus	Clostridium tetani (spores in soil)	Not from scratch alone; but any break warrants booster if >5-10 yrs.

Immediate Care

1. Wash with soap and running water.
2. Apply antiseptic (chlorhexidine, povidone-iodine).
3. Cover if deep or dirty.
4. Monitor for signs of infection: increasing redness, warmth, swelling, pus, red streaks, fever.

Prevention

• Keep nails short, clean.
• Avoid scratching; use anti-itch remedies.
• Tetanus booster per schedule.
• Hand hygiene.

Most nail scratches heal uneventfully; prompt care minimizes risk.