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Sore large lump near armpit

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I was having a shower when i notice that i had a large lump on the corner of my armpit. You can see this lump when my arm is down and up. It is very sore and when i pushed on it i felt a hard ball type of lump. I am very concerned as I believe it is breast cancer. It is only on the left side, i have checked my breasts and they are clear. I have only noticed it today, the first day of my menstrual cycle. It was not there the last time i had a shower, 3 days ago. I have found a picture which perfectly describes the lump derarm.jpg
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replied June 13th, 2009
You should get examined by a Surgeon to know the type of swelling it might be an enlarged lymph node and may be due to some infection or a benign tumor of breast(eg Fibroadenoma)that is related to menstrual cycle like this becomes painful.
You may need examination by an expert and if needed USG, Mammography etc and if the swelling is a concern please get a FNAC done to arrive at tissued diagnosis for better management.
Fibroadenoma being a benign breast lesion can be treated easily and may require removal(surgically).

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