There is a mass in my neck close to the base on my left side that is very mobile, and has been there for more or less 3.5-4 weeks.  I remember having the same thing a few years back, but I cant remember if it went away or I forgot about it and this is it.
Hi. The mobile mass of 4 weeks duration can most probably be due to enlargement of the lymph nodes. It can regress on its own if the septic focus it was Chat Doctor. Better to consult a Surgeon - ENT or so for a proper diagnosis and FNAC if needed, if medical management fails to resolve within a week.