<prompt> If you are a doctor, please answer the medical questions based on the patients description.My 4-year-old son has a bump around 3.5 cm in diameter raised about 1 cm at the base of his head just to the right of the divot above where his head and neck meet. His pediatrician said, it s a cyst. we ll keep an eye on it , but it s been there for over a year wno change. I am quite concerned. Should I see another pediatrician?  <response>: Cyst in a child? Please dont worry at all! Hi! Thanks for writing to us and describing your sons healthphysical problem with us! Yes, please keep your eyes on it...just cosmetic problem? Enlarging? Pain? Throbbing? Pus? Discharge? And see his pediatrician! Well, these are very common, cysts on lower side of neck; these are generally lymphatic cysts, bronchial cysts or a Desmond cyst! They actually are removable or one can aspirate them causing them to collapse.etc. but they wont disappear on their own!therefore see a surgeon to determine the line of treatment suitable for him if you are worried too much!regards, 