Start with your regular GP. Armpit lumps may be caused by a number of different conditions; s/he will know what tests to order to determine the cause of the lump. If you're not satisfied with your GP's assessment, or s/he doesn't come up with a definitive answer, be sure to ask for a second opinion. If breast cancer is at all possible, a breast specialist would be your next step after a GP; this type of doctor deals with breast issues all the time, and would be more experienced than your GP in assessing the situation. Good luck - PJH
There are many possible causes for armpit lumps. You should probably start with your family practice doctor, especially if you already have a relationship with one. It is usually easier to get in to see a specialist with a referral from a doctor, and your doctor probably knows the best surgeons and breast specialists in your area. Your primary practice doctor can order an ultrasound and/or a mammogram, and it may turn out that the lump is a harmless cyst or enlarged lymph node that doesn't need any other treatment. Probably your doctor will send you to a general surgeon for a biopsy of the lump. If your doctor isn't sure if the lump needs biopsying, s/he might send you to a breast specialist for an expert opinion. I hope the lump turns out to be something that isn't serious.
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