hi. it is best if you consult with a doctor, preferably a general surgeon to do medical and physical examination. it might just be an axillary lymphadenopathy secondary to a recent infection, like an upper respiratory tract infection. it could also be other benign lesions such as hidradenitis suppurativa which needs, medical and surgical management. to rule out if it is related to a breast condition, it is best to initially have a breast ultrasound as a diagnostic evaluation. a tissue diagnosis or a biopsy will be done accordingly. hope this helps. good day!! ~dr.kaye