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What Causes Painless Lump On The Inner Right Bicep?

Posted on Thu, 23 Jun 2016

Question: My 16 year old son just told me about a small, marble sized bump on his inner right bicep. He noticed it several days ago and said he thinks it's a little larger now, but not certain. He said it is not painful at all. He lifts weights daily for football and is very lean. When his arm is straight, it is not really noticeable but when he flexes his bicep, you can see it clearly.

Answered by Dr. Baranidharan Kuselan (2 hours later)

Brief Answer:
Need more information

Detailed Answer:
Hi there,
Thanks for posting your query.
I am Dr.Barani and I am pleased to assist you.

Does that bump disappear if you apply pressure on it?
Are you able to move it up and down or sideways?
Is it increasing in size?

Regards,
Dr.Barani

Above answer was peer-reviewed by : Dr. Raju A.T

Follow up: Dr. Baranidharan Kuselan (17 minutes later)

Thank you for the reply. It doesnt disappear when applying pressure or pushing on it. Able to move it up and down slightly. Today is the first time I have noticed it, but he said it may have increased in size since he discovered it about a week ago, but not too much .

Answered by Dr. Baranidharan Kuselan (7 hours later)

Brief Answer:
Lipoma/sebacious cyst

Detailed Answer:
Hi,
Thanks for the additional information.
Without clinical examination and other procedures only a possible differential diagnosis can be given.

With the information you have given, the lump on his biceps could be either a lipoma or a sebacious cyst.
Both are harmless conditions.
No active intervention is needed.
If you dont want it to be there, it has to be removed surgically.

I hope that answers your query.
Let me know if you have any more question.

Regards,
Dr.Barani

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Above answer was peer-reviewed by : Dr. Sonia Raina