Let me say up front, we're not doctors here - just well-read breast cancer survivors. But none of these symptoms sound like a typical symptom of breast cancer. An underarm lump that you can see, apparently just underneath the surface of your skin, sounds like an infection of some kind; in general, cancerous lumps are far enough under the skin that they can't be seen, but can simply be felt. Itchiness is only a breast cancer symptom in very specific cases; it'll center on the breast, and will almost always get worse, and be accompanied by swelling, pain, soreness, redness, and heat. It'll look like your breast is infected. It sounds like your itchiness is more sporadic and widespread. Finally, breast pain is seldom a breast cancer symptom.

That said, any time you notice a breast change that lasts longer than a month - see a doctor. Only a doctor can put the whole picture together and come up with a diagnosis. So yes, call your doctor. Good luck - I hope you get this all figured out soon. PJH