Hi! welcome to HCM and thanks for sharing your recent health problem with us!
Well, if I were your family physician or the treating doctor for this case of painless sternal area soft tissue lump with tiredness, mucus,
difficulty breathing at night and have had
night sweats of and on, I would like to examine it first carefully and then plan the treatment according to the report of a fine needle biopsy; In such cases, the possibilities are:
1. benign lesions like lipoma,
neurofibroma,
dermatofibroma or benign cyst: 25% possibility
2. inflammatory or infective pathology like lymph nodes,
tuberculosis or an abscess 35% possibility
3. neoplastic or malignant pathology like cancer, lymphoma, plasmacytoma or metastatic cancer etc. 40% possibility
Therefore, it is very urgent to see your doctor ASAP for some investigations and then discuss the line of management accordingly!
regards!