She needs a physician to see her as soon as possible.
I do not have enough information at this time to tell you what I THINK it is.
Physician's visit first, ok?
Where is this child's parents? Are they not aware of what is going on?
She's 17 its been going on for a week but the one on her neck has been there for a month. She hasn't got any other symptoms and she hasn't visited the doctor yet.
It is possible, but I am definitely not going to say it is.
How old is she? How long has this been going on. Any other symptoms? Any medical conditions?
No doctor's visit?