Yellow Wound Discharge: Signs of Infection and When to Seek Care

Yellow discharge (pus) from a wound typically indicates infection and warrants prompt medical evaluation.

Common Causes

• Bacterial infection: S. aureus, Strep, Pseudomonas – purulent exudate (neutrophils, bacteria, debris).
• Abscess: Localized pus collection; fluctuant, erythematous, tender.
• Cellulitis: Spreading skin infection – redness, warmth, swelling, pain.
• Impetigo: Superficial, honey-colored crusts (often S. aureus, Strep); contagious.
• Ecthyma: Deeper ulcerative form of impetigo; "punched-out" ulcers.
• Foreign body reaction: Suture, splinter – purulent drainage.

Red Flags (Seek Immediate Care)

• Spreading redness, streaks (lymphangitis).
• Fever >38°C (100.4°F), chills.
• Increasing pain/swelling beyond wound margins.
• Immunocompromised, diabetic, vascular disease.
• No improvement with 24-48h local care.

Initial Home Care (Minor, Early)

• Clean with saline/mild soap; apply topical antibiotic (bacitracin, mupirocin).
• Cover with sterile dressing; change daily.
• Elevate if extremity.

Do not ignore pus. Untreated infection can progress to sepsis, necrotizing fasciitis, or osteomyelitis.