Dear Ark82: It is not uncommon to have an ingrown hair or pimple under the arm. Give this a week or so. If it does not go away or if it gets larger, give your doctor another call.
I too have just noticed lump under arm, actually i had one about 3 weeks ago and it dissapeared after 1 week. Now I have it back again and it's really sore, it's a bit red, but not itchy or anything. Should I see a doctor?
A couple of months ago I noticed a lump under my left arm. It is just at the point of my arm meeting my armpit.It has since gotten bigger now about the size of a small walnut), and tender at times. Other times it almost feels itchy for lack of a better term. IF I hold my arm out in front of a mirror I can see it. If I grasp the skin on either side I can feel it. Is this an area that may be a node or might be breast cancer related? I am not sure as this isn't exactly in my arm pit. Please relay any information that may be helpful. Thank you.