Breast cancer can cause several visible changes on the skin, ranging from subtle dimpling or texture changes to obvious redness, swelling, or open wounds. The specific appearance depends on the type and stage of cancer involved. Some skin changes develop gradually over weeks or months, while others, particularly in inflammatory breast cancer, can appear suddenly and spread across a large area of the breast.
Dimpling and Skin Texture Changes
One of the most recognizable skin signs is dimpling or puckering, where a small area of the breast skin pulls inward, creating an indentation. This happens when a tumor growing beneath the surface tugs on the tissue connecting it to the skin. Dimpling can be subtle and easy to miss in normal lighting or posture. Raising both arms overhead or pressing your hands firmly against your hips tenses the skin over the breast and can make a hidden dimple or retraction more obvious.
A more dramatic texture change is called peau d’orange, a French term meaning “orange peel.” The skin develops a pitted, bumpy surface that closely resembles the rind of an orange. This occurs when cancer cells block the tiny lymph vessels in the breast skin, causing fluid to build up and creating that distinctive stippled pattern. Peau d’orange is most closely associated with inflammatory breast cancer, though it can occur in other locally advanced cases as well.
Redness, Swelling, and Color Changes
Inflammatory breast cancer is responsible for the most striking skin changes. It makes the breast look swollen and inflamed, often covering a third or more of the breast surface. The skin discoloration varies by skin tone: it may appear red or pink on lighter skin, and purple or bruised-looking on darker skin. The breast can feel heavy, warm, burning, or tender. These changes often come on rapidly, over days to weeks, which is one reason this type is frequently mistaken for an infection.
The key distinction from a breast infection (mastitis) is context and response to treatment. Mastitis typically affects younger women who are breastfeeding and improves with antibiotics. Inflammatory breast cancer tends to occur in older, non-lactating women, and antibiotics will not reduce the redness or swelling. If a course of antibiotics fails to improve an inflamed breast, cancer needs to be ruled out.
Nipple and Areola Changes
A less common but important presentation is Paget disease of the breast, which specifically affects the nipple and the darker ring of skin surrounding it (the areola). It can look remarkably like eczema or dermatitis, which often delays diagnosis. The signs include:
- Flaking or crusting on or around the nipple, sometimes with a yellowish or bloody discharge
- Thickened skin on the nipple that feels rough or scaly
- Redness or itching that doesn’t respond to typical skin creams
- A flattened nipple that gradually loses its normal projection
Nipple inversion, where the nipple turns inward, can also occur in inflammatory breast cancer. A nipple that has always been slightly inverted is usually not a concern, but a new inversion that develops in a previously normal nipple warrants evaluation.
Open Wounds and Ulceration
In locally advanced breast cancer that has gone untreated or has not responded to treatment, the tumor can grow through the skin surface. This creates what’s called a fungating wound: an open, ulcerated area where malignant cells have broken through the skin’s integrity. These wounds can become large, sometimes involving much of the breast, and are prone to infection. Surrounding skin may show smaller satellite lesions, which are spots of cancer that have spread through the skin nearby. This presentation is uncommon in countries with routine screening but still occurs, particularly when diagnosis is delayed.
What These Changes Look Like Day to Day
Not every skin change on the breast is cancer. Rashes from heat, friction, allergic reactions, and eczema are all far more common. What distinguishes potentially concerning changes is their persistence and their failure to respond to ordinary treatment. A rash that clears up with moisturizer or an antihistamine is unlikely to be cancer. Skin changes that stick around for more than two to three weeks, that progressively worsen, or that involve structural changes like dimpling, nipple inversion, or orange-peel texture deserve a closer look.
When you check your breasts, good lighting matters. Stand in front of a mirror in a well-lit room. Look with your arms relaxed at your sides, then with both arms raised overhead, and finally with your hands pressed against your hips. Each position shifts the breast tissue differently and can reveal dimpling or contour changes that aren’t visible in a single pose. Compare both breasts to each other. Asymmetry that’s new, particularly skin texture or color that affects only one breast, is more meaningful than changes that appear on both sides.
Skin discoloration that looks like a bruise but wasn’t caused by an injury, a patch of thickened or scaly skin on the nipple that won’t heal, or a sudden increase in breast size with visible redness are all patterns worth getting evaluated promptly. A biopsy, where a small tissue sample is taken for examination, is the definitive way to determine whether skin changes are caused by cancer or something benign.