Conversation: The conversation between human and AI assistant.
[|Human|] Dear doctor .. I m on my vacation with my little 4 year old boy .. I felt like a small cyst on his back of his left side head it is painless and movable .skin is not red nor irritated He seems so healthy no weight loose fever or any other condition . I didn t sleep since 2 days so worried about my only son
[|AI|]  Hi, Thanks for writing in. From the description of the cyst on the head, it appears that it might be a scalp swelling, There are many kinds of swelling involving the head and scalp. Some of these remain inactive for a long time and might become enlarged slowly with time. These are commonly cysts like sebaceous cysts and can have a central opening when looked at closely. There are other cysts like epidermis cyst or Desmond cyst. Dermis and epidermis are slow-growing benign cysts that typically occur in the scalp and the skull of infants and young child Chat Doctor.  All these cysts are essentially benign. It will help to consult your doctors once you are back from your vacation. Please do not worry.