Can Men Get Breast Cysts? Tests for Male Breast Lumps

Yes, men can develop true breast cysts (fluid-filled sacs), but they are quite rare ^[1]. While a new lump might turn out to be a harmless cyst or another benign (non-cancerous) condition, a male breast lump should never be self-diagnosed ^{[2] [3]}. Any new, changing, or unexplained mass in the breast area requires professional medical evaluation to determine exactly what it is and to rule out more serious conditions. It is normal to feel worried or embarrassed about a breast lump, but doctors evaluate these symptoms routinely.

What Else Could a Male Breast Lump Be?

If you feel a palpable lump (one you can feel with your fingers), a breast cyst is just one of several possibilities. Because men have breast tissue, they can develop several types of growths:

• Gynecomastia: This is the most common cause of a palpable male breast lump ^[2]. It is a benign enlargement of glandular breast tissue (the milk-producing glands and ducts). It typically feels like firm or rubbery tissue beneath the nipple, and it can be tender ^{[4] [5]}. Your doctor may review your prescription drugs, supplements, and overall health, as gynecomastia can be related to medications or underlying health conditions ^[3].
• Epidermal inclusion cysts: These are benign cysts that form just under the skin rather than deep in the breast tissue ^{[6] [7]}. They are sometimes imprecisely called “sebaceous cysts.”
• Lipomas: Harmless, localized collections of fatty tissue ^[2].
• Male breast cancer: Although rare (accounting for about 1% of all breast cancers), men can develop breast cancer. It is often described as a painless, hard, and fixed mass located off-center from the nipple ^{[2] [4]}. However, these are just tendencies—cancer can sometimes be central, mobile, or painful, and benign lumps can sometimes feel firm or irregular. Therefore, how a lump feels cannot reliably rule cancer in or out ^{[4] [5]}.

Reasons to Seek Prompt Medical Assessment

Most breast lumps are not emergencies, but you should arrange a prompt medical appointment to have any new or persistent lump checked. (Note: If you have rapidly worsening redness, severe pain, warmth, fever, or pus, seek urgent medical care, as these may be signs of an infection).

Certain symptoms strongly indicate the need for prompt diagnostic evaluation ^{[8] [3]}:

• A lump that feels hard, is fixed in place, or is located away from the center of the nipple ^{[8] [9]}.
• Nipple changes, such as the nipple pulling inward (retraction) or changes in the skin texture around it ^[10].
• Discharge from the nipple, particularly if it is bloody or happens without squeezing ^{[5] [10]}.
• Skin changes over the breast, such as dimpling, puckering, thickening, or open sores (ulceration) ^[8].
• Swollen lymph nodes in the armpit (the axilla) ^[8].
• Noticeable growth or progressive enlargement of the lump over time ^[11].

How Doctors Test a Male Breast Lump

Because benign conditions and breast cancer can look and feel similar, doctors use a careful, step-by-step approach to evaluate a lump ^{[2] [3]}.

Clinical Examination

Your doctor will start by discussing your medical history and physically examining the lump ^[3]. If the exam shows an obvious case of gynecomastia without any concerning features, further imaging might not be necessary ^{[3] [12]}. However, if the lump’s cause is indeterminate (unclear) or suspicious, testing will proceed.

Diagnostic Imaging

Depending on your age, physical examination, and local medical protocols, imaging tests are used to get a clear picture of the tissue ^{[3] [12]}. Diagnostic imaging is more detailed than a routine screening.

• Targeted Ultrasound: This uses sound waves to create images of the inside of the breast. It is highly effective at distinguishing between a fluid-filled cyst and a solid mass. It is generally the initial test used for men under 25 ^{[3] [12]}.
• Diagnostic Mammography: This specialized X-ray of the breast is typically the first imaging step for men aged 25 and older, often supplemented by an ultrasound ^{[3] [12]}. Highly concerning physical exams may change the order of these tests.

What Happens if Imaging Shows a Cyst or Mass?

The next steps depend on what the imaging reveals ^{[2] [3]}:

• Simple Cysts: If the scan confirms a simple, fluid-filled cyst, it is usually benign and may only require observation. If it is large or painful, a doctor might use a needle to drain (aspirate) the fluid. Never try to squeeze or drain a lump yourself.
• Complex Cysts or Solid Masses: If the imaging shows a complex cyst (one with solid components or thick walls) or an indeterminate solid mass (a lesion), further testing or tissue sampling is usually required.
• Image-Guided Core Needle Biopsy: For suspicious or unresolved findings, a doctor will use ultrasound or a mammogram to guide a hollow needle to the lump and remove small pieces of tissue ^[12]. This procedure is minimally invasive and usually provides the definitive diagnosis of whether a mass is benign or cancerous ^[13].