Breast Cancer Rash: What It Looks Like and What It Means
Written by North Editorial Staff | Clinically reviewed by Laura Morrissey, RN, BSN | Last reviewed: March 2026
Key Takeaways
Most breast rashes are not cancer — common causes include eczema, contact dermatitis, fungal infection, and mastitis. However, some rashes are caused by cancer and warrant prompt evaluation.
Inflammatory breast cancer (IBC) is a rare but aggressive form that often presents as a rash or skin change rather than a lump. It can be mistaken for infection. Symptoms include redness, warmth, skin thickening, and a peau d’orange (orange-peel) texture.
Paget’s disease of the breast causes a rash or eczema-like change affecting the nipple and areola and is associated with an underlying breast cancer in the majority of cases.
A rash or skin change that does not respond to standard treatment within 1–2 weeks, or that is accompanied by other breast changes, should be evaluated by a doctor promptly.
IBC is not typically detected on mammogram — if IBC is suspected based on symptoms, imaging and biopsy are required regardless of mammogram findings.
When a Breast Rash Could Be Cancer
Skin changes on or around the breast are common and usually benign. The vast majority are caused by dermatological conditions — eczema, contact dermatitis, psoriasis, fungal infections — or infection-related conditions such as mastitis. However, two specific cancer types cause skin changes that can be mistaken for non-cancerous conditions:
Inflammatory breast cancer (IBC): A rare, aggressive form of breast cancer that often presents without a lump but with rapid, dramatic skin changes.
Paget’s disease of the breast: A cancer involving the nipple-areolar complex that causes a chronic eczema-like rash of the nipple and areola.
Understanding the distinction between these and benign causes is important because delays in diagnosis, particularly for IBC, can significantly affect outcomes.
Inflammatory Breast Cancer: The Most Important Cause
What Is Inflammatory Breast Cancer?
Inflammatory breast cancer (IBC) accounts for 1–5% of breast cancer diagnoses in the United States, but it is responsible for a disproportionate share of breast cancer deaths because it is frequently diagnosed late, often after being treated as mastitis or cellulitis.
IBC does not typically present as a discrete lump. Instead, it causes rapid changes to the breast’s appearance caused by cancer cells blocking the lymph vessels in the breast skin. Because these changes can look and feel like an infection — redness, warmth, swelling — it is frequently misdiagnosed, sometimes for weeks or months.
Symptoms of Inflammatory Breast Cancer
IBC symptoms typically develop rapidly — often over days to weeks — and include:
Redness (erythema): Often covering more than one-third of the breast surface. The skin may appear pink, red, or purple.
Warmth: The affected breast feels noticeably warmer to the touch than the other breast.
Swelling: The breast may increase in size, feel heavy or firm, or look larger than the other breast.
Peau d’orange: The skin develops a dimpled, thickened texture resembling orange peel. This is caused by lymphatic obstruction causing the skin to puff up between the pores.
Nipple changes: The nipple may become inverted (turn inward) or flattened.
Pain or tenderness: Many women with IBC report breast pain, heaviness, or a burning sensation.
Swollen lymph nodes: Visible or palpable swelling under the arm or near the collarbone.
IBC does not typically cause a palpable lump. If you have the above symptoms but cannot feel a lump, that does not rule out IBC.
How IBC Is Diagnosed
Because IBC is a clinical diagnosis as much as a pathological one, the diagnostic process differs from typical breast cancer:
Imaging: Mammogram and ultrasound are performed, but a negative mammogram does not rule out IBC. MRI is often used as well, given its higher sensitivity for evaluating the extent of skin and breast involvement.
Biopsy: A skin punch biopsy is often performed to look for cancer cells in the dermis (skin), which is characteristic of IBC. A core needle biopsy of the breast tissue itself is also usually done.
Clinical criteria: Diagnosis of IBC typically requires: rapid onset of breast redness, edema, and peau d’orange involving at least one-third of the breast skin, with or without a palpable mass.
IBC is classified as at least Stage IIIB at diagnosis, and approximately one-third of cases have metastatic spread at the time of diagnosis.
What to Do If You Suspect IBC
If your breast develops sudden redness, warmth, and swelling, particularly if it is not getting better with antibiotics in 1–2 weeks, see your doctor promptly and ask specifically about IBC. If there is continued concern, request referral to a breast specialist or comprehensive breast program with experience in IBC.
Paget’s Disease of the Breast
What Is Paget’s Disease?
Paget’s disease of the breast (not to be confused with Paget’s disease of the bone) is a rare condition involving cancer cells in the skin of the nipple and areola. It accounts for approximately 1–3% of breast cancer cases. The vast majority of patients with Paget’s disease have an underlying breast cancer, either ductal carcinoma in situ (DCIS) or invasive breast cancer, in the same breast.
Symptoms
Paget’s disease presents as a chronic eczema-like rash of the nipple and areola that does not respond to standard skin treatments. Symptoms include:
Redness, scaling, crusting, or flaking of the nipple or areola skin
Itching, burning, or tingling
Nipple discharge — may be clear, yellow, or bloody
Nipple inversion or flattening over time
The rash typically affects the nipple first, then may extend to the areola; unlike eczema, it almost always starts at the nipple
Paget’s disease is sometimes confused with eczema, contact dermatitis, or psoriasis of the nipple. The key distinguishing feature is that true eczema of the nipple usually affects the areola first (or both simultaneously) and typically responds to topical steroids. Paget’s disease starts at the nipple tip, is unilateral, and does not resolve with standard treatment.
Diagnosis and Treatment
Diagnosis is made by nipple skin biopsy, which reveals characteristic Paget cells (large, malignant cells with pale cytoplasm). Further workup — mammogram, MRI, biopsy of underlying tissue — is required to determine whether and where an underlying cancer is present.
Treatment depends on the extent of disease. Options include surgery (lumpectomy with radiation if disease is limited to the nipple-areola complex, mastectomy if the underlying cancer is extensive), chemotherapy, radiation, and/or endocrine therapy, depending on the underlying cancer’s characteristics.
Treatment-Related Rashes
Patients undergoing breast cancer treatment may develop rashes as side effects:
Radiation dermatitis: Redness, dryness, peeling, or blistering of the skin in the treated area. Ranges from mild pink discoloration to severe moist desquamation. Managed with gentle skin care, topical treatments, and in severe cases, temporary interruption of radiation.
Drug-related rashes: Certain targeted therapies, particularly neratinib, lapatinib, and tucatinib, can cause skin rashes. Some chemotherapy agents also cause skin changes. Your oncology team will advise on what to watch for and when to report skin changes.
When to See a Doctor
See your doctor promptly for any of the following:
Breast redness, warmth, or swelling that develops rapidly (within days to weeks) and does not respond to antibiotics within 1–2 weeks
Redness or skin change covering a significant portion of the breast
Any nipple rash, scaling, crusting, or discharge that is new, persistent (more than 2 weeks), or not improving with standard treatment
Peau d’orange (dimpled, orange-peel skin texture) anywhere on the breast
Inverted nipple that is new (not present before)
Breast rash or skin change accompanied by swollen lymph nodes under the arm
Even if a rash turns out to be benign, getting a prompt evaluation avoids delays if cancer is present. IBC in particular is a situation where weeks matter.
Frequently Asked Questions
What does inflammatory breast cancer look like?
Inflammatory breast cancer typically presents as sudden-onset breast redness (often covering a large portion of the breast), warmth, swelling, and a dimpled, thickened skin texture called peau d’orange — resembling an orange peel. The breast may appear larger than the other one and feel heavy or tender. It usually develops over days to weeks and often looks similar to a breast infection or mastitis.
How is inflammatory breast cancer different from a breast infection?
Both IBC and mastitis (breast infection) can cause redness, warmth, and swelling. Key differences: mastitis is more common in breastfeeding women and typically improves with antibiotics within 1–2 weeks. IBC does not improve with antibiotics. IBC is also more likely to cause peau d’orange, nipple inversion, and lymph node swelling. If a breast infection is not resolving with treatment, request further evaluation including biopsy.
What is peau d’orange and is it always cancer?
Peau d’orange (French for “orange skin”) is a skin texture change where the breast skin develops dimples or pitting resembling the surface of an orange. It is caused by lymphatic obstruction — lymph fluid backing up in the breast skin and creating the characteristic dimpling. While it is most commonly associated with inflammatory breast cancer, it can occasionally be seen in advanced non-inflammatory breast cancer and rarely in non-cancerous conditions like lymphedema. Any new peau d’orange should be evaluated promptly by a physician.
Can a mammogram detect inflammatory breast cancer?
Not reliably. IBC may show skin thickening or increased density on mammogram, but these findings are nonspecific, and a normal mammogram does not rule out IBC. Diagnosis of IBC is primarily clinical (based on symptoms and physical examination) and confirmed by biopsy. If IBC is suspected, imaging and biopsy are indicated even if the mammogram is unremarkable.
References
National Cancer Institute. (2024). Inflammatory Breast Cancer. https://www.cancer.gov/types/breast/ibc-fact-sheet
American Cancer Society. (2024). Inflammatory Breast Cancer. https://www.cancer.org/cancer/types/breast-cancer/about/types-of-breast-cancer/inflammatory-breast-cancer.html
Gradishar, W. J., et al. (2024). NCCN Clinical Practice Guidelines in Oncology: Breast Cancer. National Comprehensive Cancer Network. https://www.nccn.org/guidelines/guidelines-detail?category=1&id=1419
Cendán, J. C., et al. (2005). Accuracy of Intraoperative Frozen Section Analysis of Breast Cancer Lumpectomy Bed Margins. Journal of the American College of Surgeons. https://journals.lww.com/journalacs/abstract/2005/08000/accuracy_of_intraoperative_frozen_section_analysis.6.aspx
Kamal, A. H., et al. (2024). Paget Disease of the Breast. National Cancer Institute. https://www.cancer.gov/types/breast/paget-breast-fact-sheet