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.
It is revealed that Thawne recreated the chemical bath that originally gave Barry his speed, allowing Thawne to lure Barry out of the Speed Force during Final Crisis and, by using that, to create a negative Speed Force, affecting Barry and temporarily turning him into the Black Flash.