A 32-year-old multiparous woman is on postpartum day 5 after a normal vaginal delivery. She is exclusively breastfeeding. She presents with a painful, erythematous, warm, and indurated area in the upper outer quadrant of the left breast. She has a fever of 38.8°C and feels systemically unwell. The infant is breastfeeding well from both breasts. What is the most appropriate next step in management?

Explanation

## Clinical Diagnosis This patient presents with **infectious mastitis** — characterized by: - **Localized erythema, warmth, and induration** in one quadrant - **Systemic symptoms** (fever ≥38.5°C, malaise) - **Timing** (postpartum day 5 — typical for lactational mastitis) **Key Point:** Infectious mastitis is most commonly caused by *Staphylococcus aureus* (including MRSA in some regions) or *Streptococcus agalactiae*. Risk factors include milk stasis, cracked nipples, and poor latch. ## Management of Infectious Mastitis ```mermaid flowchart TD A[Unilateral erythema + fever + systemic symptoms]:::outcome --> B{Abscess present?}:::decision B -->|No| C[Start antibiotics]:::action B -->|Yes| D[Ultrasound + Drainage]:::action C --> E[Continue breastfeeding]:::action E --> F[Frequent feeds, warm compresses]:::action F --> G[Review at 48-72 hrs]:::decision G -->|Improvement| H[Continue antibiotics 10-14 days]:::action G -->|No improvement| I[Ultrasound to rule out abscess]:::action ``` ### First-Line Management 1. **Antibiotics** — empiric coverage for *S. aureus* and *Streptococcus*: - **Amoxicillin-clavulanate** 625 mg TDS (first-line in India) - **Cephalexin** 500 mg QID (alternative) - Duration: 10–14 days 2. **Continue breastfeeding** — this is safe and therapeutic: - Milk from an infected breast is NOT harmful to the infant - Continued emptying prevents abscess formation - Infant's immune system is mature enough to handle mild infection 3. **Supportive care**: - Warm compresses before feeding - Frequent feeds (8–12 per day) - Analgesics (paracetamol, ibuprofen) - Ensure proper latch and positioning **High-Yield:** The infant is breastfeeding well — there is no indication to stop. Milk from a mastitic breast is safe for the infant. **Clinical Pearl:** Reassess at 48–72 hours. If clinical improvement occurs (fever resolves, erythema fades), continue antibiotics for 10–14 days. If no improvement, suspect abscess formation and obtain ultrasound. ## Why NOT the Other Options | Option | Why Incorrect | |--------|---------------| | Stop breastfeeding | Cessation causes milk stasis, increases abscess risk, and is unnecessary — milk is safe for infant | | Ultrasound + surgery immediately | Imaging and drainage are reserved for abscess; simple mastitis responds to antibiotics + continued feeding | | Express and discard milk | Unnecessary and counterproductive; milk is safe and feeding is therapeutic | **Warning:** Do not confuse simple mastitis (responds to antibiotics + feeding) with breast abscess (requires drainage). Abscess is suspected if there is no improvement after 48–72 hours of antibiotics or if fluctuance is palpable.