Welcome to Healthcaremagic forum
I would like to know a few details about your age and sex?is the lump painful?Are you suffering from weight loss
or gain?Have You noticed any similar lumps elsewhere?when did u first notice it and how long have you been having it?Do You have any other health symptoms like cough?
If You provide these details I would be in a position to answer your query better
Iwould think of a thyroid
problem if You are a female.It could also be a lymph
node associated with an infection.causes like tuberculosis
and malignancies also need to be ruled out.
Do let me know these details so that I could guide You better and suggest a few investigations like chest xray,measurement of thyroid hormones or maybe a biopsy
thank you for consulting us