Umbilical Endometriosis: Diagnosis, Outlook, and Modern Treatment Approaches

Umbilical endometriosis is a rare form of endometriosis in which tissue similar to the uterine lining develops in or around the belly button. It can cause a painful, changing navel lump—often worse around menstruation—and should be assessed to confirm the diagnosis and discuss treatment options.

Overview: What Is Umbilical Endometriosis?

Umbilical endometriosis is a form of endometriosis that affects the skin and tissue of the navel, also called the umbilicus. Endometriosis occurs when tissue resembling the lining of the uterus grows outside the uterus and responds to hormonal changes. At the navel, this may appear as a small lump or patch that becomes painful, swollen, darker in color, or occasionally bleeds around menstrual periods.

This condition is sometimes called a Villar’s nodule. It is uncommon compared with pelvic endometriosis, which more often affects areas such as the ovaries, fallopian tubes, pelvic lining, or tissues behind the uterus. Although an umbilical lesion may be the first noticeable sign of endometriosis, it does not automatically mean that pelvic endometriosis is present.

Umbilical endometriosis is not contagious and is usually benign. However, because several skin, scar, and abdominal-wall conditions can look similar, medical assessment is important. A careful diagnosis helps ensure that symptoms are addressed appropriately and that other possible causes of an umbilical mass are excluded.

How It May Look and Feel

The most characteristic feature is a nodule, bump, or firm area in or close to the belly button. It may be brown, blue, purple, red, or skin-colored. Its size can vary from a subtle spot to a more noticeable lump, and the appearance may change during the menstrual cycle.

Symptoms often follow a cyclical pattern. Pain, sensitivity, itching, swelling, or bleeding may begin just before or during a period and improve afterward. Some people notice bloody or brown discharge from the navel. Others have a lesion that causes symptoms without an obvious monthly pattern, particularly if hormonal medications affect menstruation.

Umbilical symptoms can occur alongside pelvic symptoms of endometriosis, such as painful periods, pain during sex, chronic pelvic pain, painful bowel movements or urination during periods, or fertility concerns. However, some people have no pelvic symptoms at all. The absence of pelvic symptoms does not rule out umbilical endometriosis.

• A tender or painful navel lump
• Color changes, especially blue-brown or purplish discoloration
• Cyclical swelling, discomfort, spotting, or bleeding
• Symptoms that recur predictably around menstruation

Why Umbilical Endometriosis Develops

Umbilical endometriosis may be primary or secondary. Primary umbilical endometriosis develops without a prior operation involving the navel. The exact mechanism is not fully understood. Proposed explanations include the movement of endometrial-like cells through lymphatic or blood vessels, changes in local cells that make them behave like endometrial tissue, and immune or hormonal influences.

Secondary umbilical endometriosis occurs when endometrial-like tissue develops in a surgical scar after abdominal or pelvic surgery. This can include surgery involving the uterus or laparoscopy performed through or near the umbilicus. During surgery, cells may rarely become established in healing tissue.

Having known endometriosis may increase the likelihood that a cyclical umbilical lesion is related to the condition. Still, many people diagnosed with an umbilical lesion have not previously been told they have endometriosis. It is also important not to assume that every navel lump is endometriosis; hernias, cysts, infections, benign skin growths, scar-related changes, and less commonly other tumors may need consideration.

How Doctors Diagnose It

Diagnosis begins with a medical history and examination. A clinician may ask when the navel change began, whether it fluctuates with periods, whether there has been prior abdominal surgery, and whether pelvic pain or other symptoms are present. A cyclical pattern is a helpful clue, but it is not present in every case.

Ultrasound may be used to assess the size, depth, and characteristics of an umbilical lesion and to determine whether a hernia or another abdominal-wall problem is present. Magnetic resonance imaging may be considered when more detail is needed, particularly if the lesion appears deeper or there is concern about broader pelvic or abdominal-wall involvement.

A definite diagnosis is often made by examining tissue under a microscope after surgical removal or a carefully selected biopsy. Clinicians consider the safest approach individually because biopsies of suspected endometriosis can occasionally cause local irritation or leave a small scar. If symptoms suggest pelvic disease, a gynecologist may recommend further evaluation for endometriosis.

Photographs or a symptom diary can be useful before an appointment. Recording menstrual dates, pain, bleeding, changes in size, and any treatments used may help the clinical team identify patterns that are not always obvious during a single examination.

Modern Treatment Approaches and Outlook

Treatment is tailored to the lesion, symptoms, reproductive plans, possible pelvic endometriosis, and the person’s preferences. For a localized symptomatic umbilical lesion, complete surgical excision is commonly considered the most definitive approach. The surgeon aims to remove the visible lesion with an appropriate margin of surrounding tissue while preserving or reconstructing the shape of the navel where possible.

If the lesion involves deeper abdominal-wall layers or there is an associated hernia, repair may be needed at the same time. The removed tissue is usually sent for pathology testing to confirm the diagnosis. Discussion with a gynecologist and, when appropriate, a surgeon experienced in abdominal-wall or reconstructive procedures can help plan care.

Hormonal treatments that suppress or modify menstrual cycling may reduce pain, bleeding, or cyclical change in some people. They may be especially useful when pelvic endometriosis is also present or when surgery is not currently suitable. However, medicines generally do not remove an umbilical nodule permanently, and symptoms can return after treatment is stopped. Options may include endometriosis treatment tailored by a qualified clinician.

The outlook is generally favorable after appropriate treatment. Recurrence can occur, particularly if endometrial-like tissue remains or if there is ongoing disease elsewhere, so follow-up is important. Care is individualized; a clinician can explain expected healing, scar care, symptom monitoring, and whether further pelvic assessment is advisable.

Living With Symptoms Before Treatment

Until a diagnosis and treatment plan are established, gentle self-care can help protect the area. Keeping the navel clean and dry, avoiding picking or squeezing the lesion, and choosing loose clothing that does not rub against it may reduce irritation. If there is discharge or bleeding, a clean, non-adherent dressing can protect clothing and skin.

For discomfort, some people can use simple pain-relief measures recommended by their clinician or pharmacist. The most suitable option depends on medical history, other medicines, pregnancy plans, stomach or kidney conditions, bleeding risk, and other individual factors. No home remedy should be used as a substitute for assessment of a persistent navel lump.

Tracking symptoms across several cycles can support shared decision-making. It can also help distinguish a possible hormonal pattern from an infection or another cause of symptoms. People already receiving treatment for endometriosis should tell their care team about any new skin or scar changes, even if pelvic symptoms are otherwise controlled.

At Acibadem International, multidisciplinary specialists in gynecology, imaging, pathology, and surgery can assess umbilical endometriosis and related endometriosis concerns for international patients in JCI-accredited hospitals.

When to Seek Medical Care

Anyone who develops a new lump, persistent discoloration, recurrent bleeding, discharge, or pain at the belly button should arrange a medical evaluation. Assessment is particularly important when symptoms appear or worsen around menstruation, after abdominal surgery, or alongside symptoms suggestive of pelvic endometriosis.

Prompt medical advice is recommended if the lesion grows quickly, becomes increasingly painful, develops an ulcer or open sore, or changes significantly in color or shape. These features do not necessarily indicate a serious condition, but they require examination rather than self-diagnosis.

Urgent care may be appropriate for severe or escalating abdominal pain, fever, spreading redness, pus-like discharge, vomiting, inability to pass stool or gas, or a painful irreducible bulge at the navel. These symptoms can point to infection, a hernia complication, or another condition that needs timely care.

Frequently asked questions

Is umbilical endometriosis the same as pelvic endometriosis?

Umbilical endometriosis is endometriosis affecting the navel or nearby abdominal-wall tissue, while pelvic endometriosis affects structures within the pelvis. A person may have one or both. Evaluation may be needed to determine whether pelvic endometriosis is also present.

Can umbilical endometriosis cause bleeding from the belly button?

Yes. Some people have light bleeding or brownish discharge from the navel, often around menstruation. Bleeding can also have other causes, so it should be assessed by a healthcare professional.

Can an ultrasound diagnose umbilical endometriosis?

Ultrasound can help characterize a navel lump and assess whether it extends into deeper tissue or could be a hernia. It may support the diagnosis, but pathology examination of removed tissue is often the most reliable way to confirm endometriosis.

Does umbilical endometriosis always require surgery?

Surgery is often recommended for a localized symptomatic lesion because it can remove the tissue and confirm the diagnosis. Hormonal treatment may help control cyclical symptoms in selected situations, but it may not eliminate the lesion. The best approach depends on symptoms, lesion features, and individual goals.

Can umbilical endometriosis return after removal?

It can recur, although complete removal may lower that possibility. Ongoing endometriosis elsewhere in the body and residual affected tissue can influence recurrence risk. Follow-up helps address new or returning symptoms early.

Is umbilical endometriosis cancer?

Umbilical endometriosis is usually a benign condition and is not cancer. Nevertheless, any new or changing umbilical lump should be medically assessed because different conditions can have similar appearances and a confirmed diagnosis guides appropriate care.

References

• American College of Obstetricians and Gynecologists
• European Society of Human Reproduction and Embryology
• National Institute for Health and Care Excellence
• World Health Organization

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.