Hello, 

Ive got a large growth on my upper spine/neck, it's approx 5 inches by 4inches in a dome shape which appeared suddenly on new years day.  I went to urgent care who admitted me to EAU and ran blood tests, was told no infection, had an ultrasound which showed no fluid or infection etc. 

Now I'm stuck in limbo not knowing what it is, at 1st they suggested lipoma but because it suddenly appeared overnight they said it can't be.

This is a large large lump and I'm concerned it could be something more serious, would a blood test In a and e show up anything more sinister like cancer?? Should I be getting more tests done on the lump, a biopsy etc to gain a proper diagnosis?

Thanks in advance