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What is the swollen bump protruding from my upper back? Could it be a tumor?

I'm a 30 year old male who works from home and occasionally goes backpacking. I don't know if my backpacking can contribute to a buildup of fluid in the back, such as a lactic acid buildup. The bump is somewhat soft to the touch, and I wonder if it may be fat buildup below the skin, or a cyst. I'm on no medications. Should I have a scan done?
Luckily, bumps on the back under the skin are actually quite common and they are usually not a serious medical problem. That being said, if the bump grows rapidly or if you start to notice other bumps in other places, or if the bump becomes red and inflamed, you should have it checked out by your primary care doctor. Similarly, any unexplained fever, loss of appetite, or weight loss should also be checked out by your doctor. One likely possibility is that this is a lipoma. Lipomas are benign tumors of fatty cells that are more common as we age. The appear soft and fleshy and usually move easily under the skin. Lipomas are not serious and do not need treatment. However, sometimes they can continue to grow and become uncomfortable or unsightly, in which case you can talk to a surgeon about taking it out. Another possibility is a sebaceous cyst, which is a collection of thick cheeselike material under the skin. Often these cysts have a pore and will sometimes leak fluid out and will occasionally become inflamed. Again, these are not dangerous but are often removed because they become infected or uncomfortable. Talk to your primary care doctor if you have any more questions.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under Zocdoc’s Terms of Service.

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