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What is this lump on my ribs?

I have a hard, painless lump on my ribs (upper, right side, back beneath my arm.) I'm a guy, age 38. I haven't had any injuries in that area, or anything else I could imagine would cause it. What should I do?
The development of any mass or new growth should always be evaluated by a qualified physician. Since we cannot be sure what this is from your description, it is probably best for you to see a primary care physician such as a family doctor or internal medicine doctor. Your lump could be one of several different things. Sometimes when we get an infection, lymph nodes in the area can enlarge and be felt. There are lymph nodes under your arm pit. Sometimes small benign tumors can form. One such tumor is a lipoma, which is just a small mass of fatty tissue that has enlarged. Sometimes a previous infection or minor trauma to an area can form a ball of scar tissue of a cyst which can feel like a hard painless lump. In very rare cases, these masses can be a malignant tumor of the soft tissue called a sarcoma. Because of these rare, but dangerous possibilities, you should be evaluated soon. I suggest that you schedule an appointment to see your primary care physician. He or she can take a close look at this lump and determine what it most likely is. If it is benign, but still bothersome to you, then you could have it removed surgically. Good luck.
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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