i am 13 and have a little ball in my neck. It does not hurt much, and i don't know if i really have to see a doctor. Any ideas?

Don't worry about it. More than likely it is just a swollen lymph node. If it doesn't hurt just wait and watch to see if it changes or gets larger. If it starts causing problems such as pain then go to the doctor. I have one on the right side of my neck and if you touch it, it feels like a little marble. As long as it doesn't hurt just obeserve and see what happens!:)

thank you very much for your advice. You always have to watch out for these things. Ill keep you informed. Thaks again!