I have a swollen lymph node in my right armpit. i had a breast biopsy on that side 5 days ago and just got my period. i also am currently having a herpes breakout. it is sore and my armpit is painful. could these be the cause?

Most likely the lymph node swelling is due to the breast biopsy. If you have eruption of herpes zoster on the right chest or right back, that would be also the cause of the swollen lymph node. A reactive lymph node may be painful. Just in case it may be infected, take a close look at the arm pit. Any redness? extreme tenderness to touch?, any red streak from the biopsy site? Then see your doctor.

The issues you described could result in an enlarged lymph node. You may feel the node, gently, if the node more than doubles in size, you develop fever, or other lymph nodes get enlarged nodes, see your doctor. Wish you good health!

It may be incidental bad luck that your herpes outbreak happened at the same time as your axilla tenderness. I agree with the other doctors that the lymph node is reactive and swollen from the biopsy. With time that should go away if it doesn’t go away in two weeks please see your physician.