Treatment for Mastitis with Open Wound
For mastitis with an open wound, the primary treatment is drainage (either through stab incision with drain placement or aspiration depending on fluid characteristics), combined with antibiotics targeting Staphylococcus aureus and streptococci, with wound management using dressing changes rather than packing. 1
Immediate Management Algorithm
1. Assess Infection Severity and Type
First, determine if this is:
- Lactational mastitis with abscess (most common in breastfeeding women)
- Non-lactational mastitis (periductal, granulomatous, or other)
- Surgical site infection (if post-operative)
Look for systemic signs:
- Temperature >38.5°C
- Heart rate >110 beats/minute
- WBC >12,000 cells/µL
- Erythema extending >5 cm from wound margins 2
2. Drainage Strategy
For lactational mastitis with thick fluid collections:
- Perform stab incision with drain placement (no packing required) 1
- This can be done in the office setting for most patients
- Operative drainage is only needed if the patient cannot tolerate office procedure 1
- Avoid repeated aspirations as lactational abscesses typically contain thick fluid not amenable to needle aspiration 1
For thinner fluid collections:
- Ultrasound-guided aspiration may be attempted first 3
- If aspiration fails, proceed to incision and drainage 3
Critical point: Simply covering the wound with a dry sterile dressing is usually most effective after drainage. Packing causes more pain without improving healing 2
3. Antibiotic Selection
If systemic signs present OR erythema >5 cm:
For lactational/community-acquired mastitis:
- First-line: Dicloxacillin or cephalexin (covers methicillin-susceptible S. aureus and streptococci) 2
- If MRSA suspected/confirmed: Doxycycline, clindamycin, or trimethoprim-sulfamethoxazole 2
- Duration: Minimum 10 days if phlegmon present 1
For surgical site infections (if wound involves GI/genital tract):
- Cephalosporin + metronidazole, OR
- Levofloxacin + metronidazole, OR
- Carbapenem 2
If minimal systemic signs (<38.5°C, WBC <12,000, erythema <5 cm):
4. Wound Management
- Cover with dry sterile dressing - this is superior to packing 2
- Perform dressing changes until healing by secondary intention 2
- Consider negative pressure wound therapy (NPWT) for large wound cavities or therapy-resistant cases 4, 5
- NPWT is safe during ongoing lactation and does not interfere with breastfeeding 5
5. Culture and Gram Stain
- Obtain culture from purulent drainage to guide antibiotic therapy 2
- Gram stain can help identify early streptococcal or clostridial infection (requires immediate treatment) 2
- For granulomatous mastitis specifically, culture may identify Corynebacterium requiring doxycycline 1
Special Considerations
Lactational Mastitis
- Distinguish infectious from non-infectious - only infectious requires intervention beyond supportive care 1
- Patient can continue breastfeeding throughout treatment 1, 5
- Resolution may take weeks; temporary milk fistula may develop but typically resolves with local wound care 5
Granulomatous Mastitis (if suspected)
- Requires core biopsy for pathologic confirmation 1
- If Corynebacterium-associated (CNGM): treat with doxycycline 1
- If idiopathic: avoid antibiotics - use intralesional steroids for worsening symptoms 1
- Avoid surgical excision - high recurrence rate and can take up to 18 months to resolve 6, 1
Common Pitfalls to Avoid
- Do not pack the wound - causes unnecessary pain without benefit 2
- Do not perform repeated aspirations for thick lactational abscesses - they require incision and drainage 1
- Do not use antibiotics alone without drainage for established abscess 2
- Do not give empiric antibiotics for granulomatous mastitis unless Corynebacterium identified 1
- Do not rush to wide surgical excision - reserve for truly refractory cases with fistula formation 1