LYMPH•LOGISCH · Understand your symptoms
A lump after breast surgery: fat necrosis?
A firm area after breast surgery or fat grafting can be unsettling. One possible cause is benign fat necrosis. Understand the tissue changes, how they may develop over time and where physiotherapy fits.
What does fat necrosis mean?
Fat cells can die when damaged or inadequately supplied with blood. As the body remodels the area, oil cysts, firm scar tissue or calcifications may form. This can follow breast surgery, flap reconstruction, fat grafting or radiotherapy. Confirmed fat necrosis is benign, but it is not the same as an ordinary scar or every other firm area. [3], [4]
Why does diagnosis come first?
Feeling a new lump is not enough to establish its cause, and imaging appearances can overlap. A new or changing lump should therefore first be assessed by your breast team or doctor. Ultrasound, mammography and a tissue sample when findings are uncertain can establish the diagnosis. Only then can the team decide whether monitoring is appropriate. [4]
Can the area become smaller on its own?
Yes. Confirmed fat necrosis may become smaller and less noticeable, and sometimes disappear. This often takes months to years. Other lesions remain palpable or leave calcifications. Becoming smaller does not automatically mean becoming completely soft. Existing research mainly measures lesion size and ultrasound visibility, rather than reliably measuring the personal sensation of softness. [1], [2]
What can physiotherapy support?
Once the diagnosis is established and in agreement with medical follow-up, I address accompanying symptoms such as restricted shoulder movement, scar tightness or additional tissue swelling. Manual techniques and exercises are adapted to the findings and tissue tolerance. This differs from treating fat necrosis itself. Evidence is currently insufficient to show that lymphatic drainage or scar massage specifically shrinks fat necrosis or speeds up its resolution. [3]
When is medical treatment needed?
When the diagnosis is secure and symptoms are mild, monitoring can be appropriate. A bothersome oil cyst may sometimes be aspirated. Significant pain, growth, uncertain diagnosis or additional wound problems may prompt discussion of other procedures, including removal. Surgery is not automatically the best option because it may leave new scarring or a tissue defect. Your findings and symptoms guide the decision. [3], [4]
Research in context
What do the studies show?
What do follow-up studies show?
In a 2023 study, 21 of 37 fat-necrosis lesions after DIEP reconstruction disappeared on ultrasound without surgical treatment. Among those that disappeared, this took an average of about 30 months; 16 persisted during follow-up. Smaller initial lesions disappeared more often. This small, selected group cannot predict the course after every reconstruction. [1] Another long-term observational study found near-complete resolution in 26 of 42 confirmed cases, taking an average of about 46 months among those resolving. These are observational findings, not evidence of a massage effect. [2]
Does massage help resolution?
A 2022 treatment series describes conservative management in 20 of 36 affected breasts, sometimes including local massage and medication. Without a comparable control group, it cannot determine whether massage changed the fat necrosis or whether natural progression explained the outcome. [3]
Are there newer treatment approaches?
A small randomised trial in 2025 involving 40 women reported benefits from shockwave therapy for post-reconstruction fibrosis, including softness and pain. It tested a different treatment for clinically diagnosed fibrosis. It establishes neither an effect of manual lymphatic drainage nor a suitable treatment for every case of fat necrosis. Follow-up was short at three months. [5]
Clarity before treatment.
A new firm area can understandably raise questions. It matters to me that it has been medically assessed before we discuss physiotherapy. Confirmed fat necrosis may change or become smaller over time; monitoring remains part of medical follow-up. My role is to address accompanying problems such as scar tightness or restricted movement appropriately.
Studies and clinical sources
- Moon et al. (2023)
Ultrasound follow-up of 37 fat-necrosis lesions after DIEP reconstruction without surgical treatment
- Lee et al. (2021)
Retrospective long-term follow-up after reconstruction: 42 tissue-confirmed cases of fat necrosis
- Haran et al. (2022)
Retrospective treatment series: 36 affected breasts, 20 treated conservatively; not evidence of massage effectiveness alone
- American Cancer Society / ASCO (2026)
Medically reviewed patient information on fat necrosis, oil cysts, diagnosis and management
- Nguyen et al. (2025)
Small randomised trial of shockwave therapy in 40 women with post-reconstruction fibrosis, not drainage or isolated fat necrosis
Reviewed: 16 October 2026. A selection of relevant sources, not a systematic review. Information cannot establish a diagnosis or replace an individual assessment.