Hello, I am 38 years old and I have cysts in my breast for years. I went to doctor and they did ultrasound. The radiologist said the cyst changed the shape from 2 years ago ultrasound, it is much smaller then it was, and he recommended to have a biopsy. I honestly don't feel comfortable to have biopsy done. Could cysts cause cancer? Is biopsy safe to do? I also have my period at the time when they scheduled it and doc says this is ok, but I am not sure if this is? Please advice