Thanks for writing to us.
Analysis for probabalities:
a)As per your words you have an infraclavicular swelling painfull during contraction of pectoral /trapezius and latissimus dorsi muscles. It could be a simple fibromyalgia
b)As per your history ,have you noticed the lump only now?have you been having this lump for months now. Is it associated with any long standing caugh/evening rise in temperature /fever/loss of appetite/loss of weight/Is it a single lump consisting of many bunched/matted together.
If the answer to the above is yes.Kindly go ahead with an excision biopsy
(Hiso Path Exam-HPE
report )of your Lt infraclavicular nodes by a general surgeon and get treated as per the Diagnosis-HPE gives definitive diagnosis.
In addition get a Chest X-ray PA view done to find out whether there are any lung lesions.
c)Do you have any other lumps on your breasts during your self examination.If so kindly consult a General Surgeon
to check you up.
As per your history the lump/infraclavicular mass is fixed to the underlying musculature.A good clinical examination by a Surgeon and HPE will give the best solution.
Wish you a quick recovery,
Dr Lt Cdr ASN Bhushan.