It could be a number of things 1. you may be sleeping on the wrong type of pillow. 2. you may have a lot of stress going on in your life right now. 3. you could have rhumitoid arthritis that you may...
The word lump is a very general, undescriptive word. With such a lack of description, one cannot give you a definite answer. If you want a proper opinion, then get a proper examination...in person...
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