Developed a Lump AFTER a Lumpectomy? Understanding Fat Necrosis, Seromas, and Other Common Causes in Beverly Hills

A lumpectomy, also known as breast-conserving surgery, is a surgical option for some women diagnosed with breast cancer. Instead of removing the entire breast, the surgeon removes the area containing the cancer along with a surrounding amount of normal tissue.

The goal is to remove the cancer while preserving as much of the natural breast as possible. For appropriately selected patients, lumpectomy followed by radiation therapy can be an effective alternative to mastectomy.

Whether lumpectomy is the right choice depends on several factors, including the size and location of the tumor, the characteristics of the cancer, the size and shape of the breast, and the patient's overall treatment plan. Watch this video of Dr. Leslie Memsic sharing when breast-conserving surgery is an appropriate option.

But removing the cancer is only the beginning of the healing process. Once the procedure is complete, the breast must repair itself, and that process can temporarily change how it looks and feels.

Yes, a lump or area of firmness can be a normal part of healing after a lumpectomy.

When tissue is removed during surgery, the area does not immediately return to its previous texture. The body begins repairing the surgical site by bringing the surrounding tissue together. As it heals, the tissue can stick together, knit together, and pull inward. This can create an area that feels hard, thickened, tight, or lumpy.

According to Dr. Heather Richardson, this is a normal part of the healing process for some patients. Over time, the tissue can gradually soften as the body continues to heal. The extent and duration of these changes can vary from person to person. The amount of tissue affected by surgery, the location of the lumpectomy, and the degree of tissue trauma can all influence the healing process. In general, the more tissue that has been disrupted, the longer it may take for the breast to soften and settle.

This means that a breast may feel noticeably different for some time after surgery. A firm area near the lumpectomy site does not necessarily mean that cancer has returned. At the same time, it is important not to dismiss a new or changing lump. Postoperative changes and recurrent breast cancer can sometimes cause similar symptoms, which is why your breast care team may recommend an examination or imaging when appropriate.

Fat necrosis is a benign, non-cancerous change that can happen when fatty tissue is damaged, whether from injury, surgery, or radiation. In the breast, it develops when fat cells lose their blood supply and die off, and the body responds by forming an area of scar tissue in their place.

After a lumpectomy, fat necrosis may occur, but it is not a sign that anything went wrong. During surgery, blood flow to the fat cells around the surgical site can be temporarily disrupted. Radiation therapy, often part of breast-conserving treatment, can add to this effect as the tissue adjusts. Fat necrosis can also occur after fat transfer to the breast, which may be performed alongside a lumpectomy to improve symmetry and fill in small divots, indentations, or hollow areas.

Can Fat Necrosis Be Seen on Imaging?

Yes. Fat necrosis can be visible on breast imaging, including mammography and ultrasound, and it can have different appearances depending on how the tissue has changed over time.

Sometimes the imaging appearance is clearly consistent with a benign process. In other cases, fat necrosis can look similar to other breast abnormalities, making additional imaging or follow-up necessary.

Depending on the clinical examination and imaging appearance, your care team may recommend monitoring the area, obtaining additional imaging, or, in some circumstances, performing a biopsy to determine exactly what is causing the change.

Can Fat Necrosis Be Fixed?

Fat necrosis is treatable, and it isn't always necessary to intervene right away. Once your physician confirms a lump is fat necrosis and does not contain cancerous cells, many patients choose to monitor it, since it often softens on its own. If it's uncomfortable or affecting the breast's appearance, it can also be treated. At Bedford Breast Center, our fat grafting experts maintain exceptionally low rates of fat necrosis to begin with. When it does occur, we use a minimally invasive technique called MILR (Minimally Invasive Lump Removal). Guided by ultrasound, this approach uses a small needle or probe to dissolve hardened fat and remove oil cysts without disturbing the surrounding healthy tissue.

MILR requires only local anesthesia, so patients avoid the downtime associated with more invasive surgery. Recovery typically takes 2 to 4 weeks, depending on the size and number of lumps.

Fat necrosis and normal healing are two possible explanations, but they are not the only ones. While many situations may occur following breast surgery, including lumpectomy, some common ones include seromas and blistering.

Seromas

Seromas happen in every surgery, forming when fluid builds up faster than the body can reabsorb it at the surgical site. If that fluid accumulates, it may need to be drained through a tube or via a skin opening to prevent it from accumulating further.

Blistering

Small blisters can appear near the edges of surgical dressings, especially with clear, non-stretchy dressings like Tegaderm, caused simply by the tape pulling on the skin rather than an allergy. A true allergic reaction looks different: a larger, irritated red patch covering the area, not a small, usually painless blister along the edge.

If you notice a new lump or area of firmness after a lumpectomy, let your breast care team know, especially if it is new, changing, or causing concern.

Your doctor may consider several factors, including:

• How long it has been since your surgery
• Where the lump is located
• Whether it is changing in size or texture
• Whether you have pain, swelling, redness, or other symptoms
• Your physical examination
• Your previous and current breast imaging

You should also contact your care team if you notice increasing redness or warmth, drainage from the incision, worsening pain, significant swelling, new skin changes, or other changes that concern you.

A breast can feel hard, tight, or lumpy for some time after a lumpectomy. As the surgical site heals, tissue can pull together and knit, becoming temporarily firm before gradually softening. Fat necrosis can also create a benign lump as damaged fatty tissue heals.

These changes are often part of the body's normal response to surgery. But a new or changing lump should still be brought to the attention of your breast care team rather than being assumed to be normal healing.

If you notice a change in your breast after a lumpectomy, you do not need to panic. You also do not need to navigate the uncertainty on your own. Your breast surgeon and care team can help determine whether the finding is part of the healing process or whether it warrants further evaluation.

What does fat necrosis feel like in the breast?

Fat necrosis can feel like a firm, hard, or sometimes tender lump in the breast. It may develop near the site of a lumpectomy or other area affected by surgery or trauma.

Is fat necrosis after a lumpectomy cancerous?

No. Fat necrosis is a benign change caused by damage to fatty breast tissue and is not breast cancer. However, because it can feel or appear similar to other breast abnormalities, a new lump should still be evaluated.

Does fat necrosis need to be treated?

Not always. If it is confirmed as fat necrosis and is not causing discomfort or cosmetic concerns, it can often be monitored to see if it softens or resolves on its own.