Sudden Lump on the Back of the Head: Causes and Concerns

There is an unexplained lump on the upper back of the head?

Hello, I suddenly noticed a lump on the top back of my head, close to the crown, with a diameter of about 2.5 cm.
There is slight tenderness when pressed, but I haven't experienced any trauma; it feels somewhat similar to a bump that has swollen after hitting it.
I specifically noticed it the day before yesterday, but it may have occurred earlier (I felt some pain while washing my hair before, but I didn't pay close attention).
I would appreciate your diagnosis, thank you.

shouyi, 20~29 year old female. Ask Date: 2015/12/07

Dr. Li Zhonghuai reply Surgery

Hello! A written description is not as effective as a direct diagnosis in the clinic.
Please come to our surgical outpatient department for an ultrasound examination.
Changhua Hospital cares about you!

Reply Date: 2015/12/07

More Info

The sudden appearance of a lump on the back of your head can be concerning, and it's important to understand the potential causes and implications. Based on your description, the lump is approximately 2.5 cm in diameter, tender to the touch, and you have not experienced any recent trauma. Here are some possible explanations for your symptoms:
1. Cyst Formation: One common cause of a lump on the scalp is the formation of a sebaceous cyst. These cysts are benign and occur when hair follicles become blocked, leading to the accumulation of sebum. They can sometimes become inflamed or infected, resulting in tenderness and swelling.

2. Lymphadenopathy: Lumps in the head and neck region can also be swollen lymph nodes. Lymph nodes can enlarge in response to infections, inflammation, or other medical conditions. If you have had any recent infections, such as a cold or throat infection, this could explain the swelling.

3. Lipoma: A lipoma is a benign tumor made up of fatty tissue. These are usually soft, movable, and painless, but they can sometimes become tender if they press on surrounding tissues.

4. Trauma: Even if you do not recall a specific injury, it is possible that a minor bump or trauma occurred that you did not notice at the time. Sometimes, a hematoma (a localized collection of blood outside of blood vessels) can form after a minor injury, leading to swelling.

5. Infection: An infection of the scalp, such as folliculitis or a more serious condition like cellulitis, could also present as a painful lump. These infections may be accompanied by redness, warmth, and possibly fever.

6. Other Concerns: While less common, other conditions such as a dermatological issue (like psoriasis or eczema), or even more serious concerns like a tumor (benign or malignant), could also present as a lump.
Given that the lump is tender and you have noted its presence for a couple of days, it is advisable to monitor it closely. If the lump increases in size, becomes increasingly painful, or if you develop other symptoms such as fever, chills, or systemic symptoms, you should seek medical attention promptly.
In terms of diagnostic steps, a healthcare provider may perform a physical examination and could recommend imaging studies, such as an ultrasound or CT scan, to better understand the nature of the lump. In some cases, a biopsy may be necessary to rule out any serious conditions.

In conclusion, while many causes of a lump on the head are benign, it is essential to remain vigilant and consult a healthcare professional for a thorough evaluation. Early diagnosis and treatment can help address any underlying issues effectively.

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