Tender armpit/ vain?

Grecia

Hi ladies! Has anyone experienced slight painful / tender armpit!?

For me its just my left side. It started last week feeling tender when i applied deodorant but i couldn’t see any redness or bumps.

This week, still tender, but I can now feel and ser the veins slightly poking out and the tenderness follows that same vein a little bit down my arm.

Im seeing my obgyn on Thursday but wanted to post in case anyone knew anything about this.