welcome to HCM!
Axillary adenopathy may be part of a generalized process or may be localized and secondary to infection in the limb. Local infection or trauma causing the enlargement of lymph
nodes and pain should be searched for carefully.
. In a female, unilateral axillary nodes raise the suspicion of a disease in same side breast as in your case left side.
If your lymph node has decreased in size then its a good sign,however if you experience further increase or new lymph nodes,then get yourself examined and get a FNAC done!