Is a Bump on the Back of the Skull Normal or a Cause for Concern?

Occipital bone protrusion?

There is a raised area on the back of the head, located slightly above the line drawn between the two eyes, with a diameter of about 1.5 cm and a height of approximately 0.3 to 0.5 cm.
It feels bony and is not painful or itchy.
Is this normal, or could there be an abnormality in the bone?

Patient Li某, 10~19 year old female. Ask Date: 2011/02/10

Dr. Shi Guozheng reply Orthopedics

There is normally a protrusion at the midline of the back of the head, but if it becomes larger, it may be necessary to consult a neurosurgeon for an examination and, if needed, to obtain an X-ray to confirm the diagnosis.

Reply Date: 2011/02/10

More Info

When it comes to bumps on the back of the skull, it's essential to consider various factors before determining whether it is normal or a cause for concern. The area you described, located at the back of the skull, is known as the occipital region. A bump in this area can arise from several causes, and understanding these can help in assessing whether it warrants further investigation.

Firstly, it's important to note that the skull is made up of several bones that can sometimes form prominent areas or bumps due to normal anatomical variations. These are often benign and do not indicate any underlying health issues. For instance, the external occipital protuberance is a normal bony prominence that can be more pronounced in some individuals, and it serves as an attachment point for muscles and ligaments.

However, there are other potential causes for a bump on the skull that may require medical attention. Here are some possibilities:
1. Lipoma: This is a benign tumor made of fatty tissue that can develop just beneath the skin. Lipomas are usually soft, movable, and painless, but they can sometimes feel firm if they are deeper.

2. Cysts: Epidermoid cysts or pilar cysts can occur on the scalp and may present as bumps. These are generally harmless but can become infected or inflamed.

3. Bone Growths: Conditions like osteoma, which is a benign bone tumor, can lead to abnormal growths on the skull. These are typically asymptomatic but may require monitoring or removal if they cause discomfort or cosmetic concerns.

4. Trauma: If there has been any recent trauma or injury to the head, a bump could be a result of a contusion or hematoma. These may require evaluation, especially if accompanied by symptoms like headache, dizziness, or changes in consciousness.

5. Infections: In rare cases, infections can lead to swelling in the area. Conditions like osteomyelitis (infection of the bone) can cause localized swelling and pain.

Given that the bump you described is approximately 1.5 cm in diameter, 0.3 to 0.5 cm in height, and is not painful or itchy, it may be less likely to be a cause for concern. However, it is crucial to monitor any changes in size, shape, or associated symptoms such as pain, redness, or warmth, which could indicate an underlying issue.

In conclusion, while many bumps on the skull can be benign and normal anatomical variations, it is always advisable to consult with a healthcare professional for a thorough evaluation, especially if there are any changes or concerns. A physical examination and possibly imaging studies, such as an X-ray or CT scan, may be warranted to rule out any serious conditions. If you have any doubts or if the bump changes in any way, seeking medical advice is the best course of action to ensure your health and peace of mind.

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