A thin string like vein/cord stretching from the area between my breast and armpit to my shoulder. sore to the touch with tiny lumps in it. i have an hs lump where this string starts as well?

What you described suggests an abscess and lymphangitis. It would be prudent to see your doctor or go the emergency department of a hospital as you may need antibiotic treatment. Do not delay seeking care.

I'm sorry, but you description is inadequate. I recommend that examination by a trusted MD be performed, and that recommendations made by this person. Sounds like an infectious process rather than malignancy. What is an "hs lump?"