well about 30 years ago I was exposed to toxic chemicals including Benzene when I was in the service at Camp Lejeune N.C., now when I get checked by the doctor for DOT physicals I always have blood in my urine moderate levels, back in 2008 an mri was done due to back pain and for the most part my spine was pretty good, but a small cyst was discovered in my right kidney, do cysts go away? because it is still showing up on an ultrasound I had done last month, and the constant blood in my urine does worry me, the VA tells me that it is nothing big to worry about that my blood work is pretty normal, and no biopsy has ever been done on the cyst.