Milk bleb and mastitis: what to know

A milk bleb may look like a small white, yellow, or clear spot on the nipple. Milk flow can feel restricted, with a tender area in the breast or pain during feeding. Inflammation can develop when milk removal is uncomfortable or when pressure and swelling build around a duct. Mastitis may cause a warm, swollen, wedge-shaped area, aching, and flu-like symptoms. A visible spot is not always the only cause of pain, so a feeding assessment can help identify latch, positioning, or pumping factors.

Continue breastfeeding or expressing according to your baby’s usual needs if you can, but avoid forceful pumping or trying to pierce the bleb. Use gentle breast support, rest, fluids, and a cool pack for swelling. Review latch and positioning rather than applying strong massage, which can irritate inflamed tissue. A lactation consultant can watch a feed, check milk transfer, and suggest a comfortable plan. Ask a clinician which pain relief is suitable for you and your baby’s feeding situation.

Contact a clinician promptly for fever, chills, rapidly spreading redness, increasing swelling, pus, or feeling generally ill. Seek assessment if a painful area does not improve, if you cannot feed or express because of pain, or if a lump persists after inflammation settles. Urgent help is needed if you feel faint, confused, or severely unwell. Do not wait for a bleb to open on its own when symptoms are worsening.

Ask whether this is a milk bleb, mastitis, or another breast problem; whether you need treatment; and which pain medicines are compatible with breastfeeding. Ask for a latch review and clear instructions about changes that should prompt recontact.