PCP says I have "reactive" lymph node on right side of neck for approx. 1 year. Now have swollen node in upper right armpit. OB says not related to breast issues. Also said had a slightly larger node in right groin area. Possible causes?

"Reactive lymph nde" Lymph nodes are "reactive" when enlarged, and can be related to more serious conditions. If your family history is positive for breast disease, a digital mammogram would be indicated. The node in the groin area may be unrelated to those in the neck and armpit, and could relate to a vaginal viral or bacterial infection. Biopsy of the node in the neck or armpit might be necessary.