Lipomas: Are They Benign or Malignant?

Is it a sebaceous cyst?

Dear Doctor,
Hello! I have a question: Over three years ago, I had a lipoma located in my armpit, which was surgically removed after I consulted a doctor.
The physician said it was benign.
However, strangely, a few months after the surgery, I developed another lipoma in my other armpit, as well as in my thigh and the area of my pelvis.
These lumps are not painful to the touch and seem to be growing.
Could this be malignant? Thank you for your response!

Xiao Ming, 10~19 year old female. Ask Date: 2004/01/13

Dr. Lin Zongzhe reply Oncology

Hello! Based on your description, it appears to be a benign lipoma.
I recommend that you visit a hospital, as the physician's visual and physical examination is also very important.
Sincerely, Dr.
Lin Tsung-Che, Taoyuan Hospital, Department of Health, Executive Yuan.

Reply Date: 2004/01/13

More Info

Lipomas are benign tumors composed of adipose (fat) tissue. They are typically soft, movable, and painless lumps that can occur anywhere in the body, but they are most commonly found in the subcutaneous tissue, such as the arms, thighs, and trunk. The fact that your doctor classified your initial lump as benign is consistent with the typical characteristics of lipomas.
The recurrence of lipomas in different locations, such as your other armpit, thigh, and pelvic area, is not uncommon. Lipomas can develop in multiple sites, and some individuals may be predisposed to forming them. This condition is known as familial multiple lipomatosis, where multiple lipomas appear over time, often in a hereditary pattern.
It is essential to understand that lipomas are generally not considered malignant. They do not transform into cancer, and the risk of a lipoma becoming malignant is extremely low. However, if you notice any changes in the size, shape, or characteristics of a lump, or if a new lump feels different from your previous lipomas, it is crucial to consult your healthcare provider for further evaluation.
In your case, since the new lumps are painless and have a tendency to grow, they still sound like lipomas, but it is always wise to have them assessed by a medical professional. A healthcare provider may recommend imaging studies, such as an ultrasound or MRI, to evaluate the characteristics of the lumps further. In some cases, a biopsy may be necessary to rule out other conditions, especially if there is any uncertainty regarding the diagnosis.

While lipomas are benign, other types of soft tissue tumors can occur, some of which may be malignant. Therefore, if you have concerns about the nature of your lumps, it is essential to discuss them with your doctor. They can provide you with a thorough examination and, if necessary, refer you to a specialist, such as an oncologist or a dermatologist, for further evaluation.

In summary, lipomas are benign tumors that can recur in different locations, and while they are generally harmless, any new or changing lumps should be evaluated by a healthcare professional to ensure proper diagnosis and management. Regular follow-ups and monitoring are advisable, especially if you have a history of multiple lipomas.

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