### Human:\nrash on shoulder that moved to neck left side and now a lump/swelling in front of neck. what could be the cause? . 24 hours ago i noticed a rash on the upper left side of my back close to my neck. tonight it has moved to my neck and i noticed a swelling on the left sick of my neck and could feel a lump that was tender to the touch. i've felt dizzy at times today.\n\n### Assistant: if you have had the chicken pox sounds like it could possibly be shingles. call your md and make an appt.