Yeah, I would go to the doctor too. I also, did the same kind of piercing (2 cartilage holes in the same year @ the same time) and when one got infected, so did the other. I would get bumps on the back of them too. Whenever I moved them, they would get infected again and I finially had to take them out and I had bumps there. They finally went away, but I never had lumps on my neck. I would go to the doctor's just in case. It could be just what lynz said, but maybe the doctor can give you some antibiotics to help with the infections. The downer might be that he/she may recommend that you will have to take them out.
*~* ShEllyLAy *~*