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Hi, this is Dr Stan, here to help you.Board Certified with 40 years of Patient Care. I will respond with my answer shortly. Thank you.
The lump sound like what is termed an "inclusion cyst" and is not a sign of cancer. The area that you are describing is not in a chain of lymph nodes either from the lungs or the breast. More in a moment.
Congratulations on your new baby girl. The lack of energy, body aches comes with "just having a baby, carrying her on your hip etc. The smokers cough should be evaluated by a Pulmonologist to make sure your years of smoking hasn't caused any permanent damage. Also consider perimenopause as part of your overall symptoms. I am here to answer any additional questions you may have. Please leave a positive rating of 3-5 stars. This is how I am compensated for my response. Thank you and enjoy your baby.