Hello ma'am and welcome.Swollen lymph nodes
in the axillary region can at times be a normal occurence around the monthly period.
If not for this, lymph nodes are a sign of either an infection or a possible anatomical abnormality like a tumor
or cancer. I would recommend a visit to your doctor to rule out all abnormalities. Please do not be alarmed, as the more serious possibilities are rare, and it is always best to rule out the worst first.
Hope this helps.