Notice a Strange Armpit Lump While Nursing? Don’t Panic!

Breastfeeding Armpit Lump (‘Pitties’): What You Need to Know

Becoming a mom brings lots of changes—some can surprise you! One of these changes is the formation of a breastfeeding lump near your armpit during nursing. These lumps are often called ‘pitties’. They are rare but completely normal.

‘these adjacent but separate axillary mounds are not a tissue extension of the primary breast. Instead, there is a growing awareness that separate focal vestigial breast mounds are consistently present in adults, located in pairs running down the curved lines of the embryological mammary ridges’ – Tail of Spence 

What are ‘pitties’?

A breastfeeding lump near the armpit is swollen tissue in the armpit that fills with milk. This happens when the milk ducts in the armpit become full and temporarily engorged. Many adults have extra breast tissue in the armpit. During breastfeeding, it can swell just like your main breasts. The lumps often feel egg-shaped or firm but are usually soft to the touch.

Armpit Lump Causes

Not everyone notices a lump near the armpit. Some people have more axillary breast tissue than others. Genetics, hormones, and milk production can affect whether you notice pitties. Even though they may seem unusual, they are a natural part of your body adapting to feed your baby.

Armpit engorgement usually occurs early in breastfeeding, when milk supply is being established. Milk may collect in the armpit tissue, creating a breastfeeding lump while feeding. This can cause swelling or mild discomfort. Most of the time, these lumps improve within 24 to 48 hours as your body adjusts.

How to Recognize Normal Pitties Versus Concerning Lumps

Most pitties are soft, tender, and appear on one or both sides. You may feel them more when your breasts are full or after feeding. If a lump near your armpit is red, hot, very painful, or accompanied by fever, contact your doctor—these may signal infection. Checking your breasts and armpits regularly can help you understand what’s normal.

Managing Discomfort

1. Breast massage: Massage helps milk flow and eases swelling. Take a warm shower or use a warm compress. Start at the outer armpit and move your fingers in gentle circles toward your chest. Use gentle but firm pressure. Massage several times a day, especially before nursing or pumping. Stop if it hurts.
2. Warm compress before feeding: Place a warm cloth on the lump to help milk flow.
3. Cold compress after feeding: This can reduce swelling and ease discomfort.
4. Cabbage leaves: Cold cabbage leaves on the lump for a few minutes may help relieve swelling. Pubmed – The effectiveness of cabbage leaf application.
5. Ultrasound treatment: In a clinic, ultrasound may relieve pain from tender lumps.

Other Helpful Tips

• Wear supportive or loose-fitting bras to reduce pressure on the armpits.
• Try different nursing positions to reduce armpit discomfort. Lying on your side or leaning forward can help milk drain better.
• Keep a simple breastfeeding journal. Track when armpit lumps appear and how you manage them—it can help you notice patterns and find what works best.
• Stay hydrated and move gently. Mild activity can help with milk flow and comfort.

When to get help

While armpit lumps are usually harmless, don’t ignore persistent symptoms. If you have ongoing pain, fever, or red streaks, contact your healthcare provider. A lactation consultant can guide you on massage techniques, nursing positions, and comfort strategies.

Even though an armpit lump can be surprising, they are another sign of how your body adapts to feed your baby. Trust your body’s natural processes and be patient with yourself. Every step, even the unexpected ones, shows how amazing your body is at nourishing life.

Finding an Armpit Lump During Pregnancy

References

• International breastfeeding support – La Leche League.