Most neck lumps are benign, but cancer is a possible cause. For adults, the chance that a neck lump is cancerous increases after the age of 50, according to the Cleveland Clinic. Lifestyle choices, such as smoking and drinking, can also have an impact.
Moreover, there are several theories whether or not Dr Wells in the one who killed Barry's mother. Movie pilot speculates that even though Dr Wells is the Reverse Flash, he isn't the one who killed Nora Allen.
Using his Negative Speed Force, Thawne traveled back in time to different points in Barry Allen's life, subtley tampering with the course of events, making The Flash's life be filled with pain and sorrow. One of these events even, was when he murdered Nora Allen, Barry's mother, an act that before, had never happened.