It looks about like what others have described at times.
A swollen lump above the collarbone area.

I don't know if any have had it explained as to what exactly it is.. but I'd say probably some spasms and some lymph blockages in the area.
or do a TOS forum search for lump near collarbone or such - the posts are a few years old that it was mentioned in.
I don't think it has been mentioned recently.

you can do a web search for videos of lymph drainage massage and try some of the techniques to see if it helps at all.

Or possibly a spasmed SCM or scalene??

have you palpated the area? hot, cold etc?