If you find changes or something unusual in one of your breasts, it’s important to see a health care provider as soon as possible. But keep in mind that most breast changes are not cancer. The best way is to consult a best doctor near to you.
It is difficult to say if it is cancer or not, but any enlarged lymph nodes in chest and arm pit area should raise a suspicion of cancer. Please consult your doctor regarding scheduling a breast ultrasound and maybe a mammogram. Take care!
The medical advice given should not be considered a substitute for medical care provided by a doctor who can examine you. The advice may not be completely correct for you as the doctor cannot examine you and does not know your complete medical history. Hence this reply to your post should only be considered as a guiding line and you must consult your doctor at the earliest for your medical problem.