Protruding bump on the left side of my upper neck that has moved slightly from 2 days ago, hurts, radiating pain through my back, should I worry?

Abscess? I have a number of questions, including how long it has been there and whether it is getting bigger or more painful. It could be an abscess (red, warm, painful), or it could be an enlarged lymph node, which could itself be infected, or could be an indication of infection elsewhere. A health provider needs to look at it and see if it needs drainage, antibiotics, or other evaluation.