Hello and welcome to HCM
Yes you should be concerned and consult your doctor and get proper diagnosis. The lump in both the armpit may be local abscess
or inflammation of Lymph
node. You surely needs a course of antibiotic and anti-inflammatory. Culture of the fluid/blood may be required.
Do regular aseptic dressing of the wound and don't squeeze it until you get to a diagnosis.
Keep the armpits dry as much as possible.
Last opinion consult your doctor and follow the advises.