What Does Cluster Of Dark/black Spots In Pelvic Area Indicate?

I just had a pelvic xray and hip xray done as my lower back/groin hurts. Additionally, I have had abdominal pain, intermittant vaginal or anal bleeding that comes and goes. My chiro ordered this xray. I got it today and there is a cluster of dark black spots in the pelvic area. What is this? Should I follow up with my MD too? I had blood work done by MD for mentioned symptoms, and she said that was normal.