I agree with Milkmaid, that's not milk goiter. There might be a splinter in there. What I did when a doe got a lump on her lower neck was shave it. We could see a small entry wound.
A friend helped me get an exudate sample to send off to WADDL in the remote event it was CL.
What the test did show was staph, e coli & something else I dont remember.
When it was ripe I seperated her. This was before lab results came back.
I injected a weak betadine solution into it & squeezed remaining gunk for a few days. Meantime she was on Pen G for about a week.
What you want is that wound to remain open, irrigating it daily for awhile with weak betadine, making sure it heals from the insiide out.
You can even pack some Pen directly into the hole without the needle in addition to her injections.
It will feel like forever.