What is a common sign of mastitis in a nursing mother?

Mastitis is an inflammatory condition of the breast that often occurs during breastfeeding. A hallmark sign of mastitis in a nursing mother is the presence of a unilateral warm, red, and sensitive area on one breast. This occurs due to inflammation and infection, which can develop when milk is retained in the breast or when bacteria enter the breast tissue through cracked skin or the nipple.

The warmth in the affected area is a result of increased blood flow, while redness is indicative of inflammation that could be accompanied by tenderness or pain. This localized change sets it apart from other conditions, as mastitis typically affects one breast rather than both. Recognizing these symptoms early is crucial for timely treatment, which may include antibiotics or other interventions.

Other options provided do not accurately reflect the typical manifestation of mastitis, making them less relevant in this context.