Bruises on baby

Bl

So my baby always seems to have bruising on his back and sometimes on his legs or hips. I first noticed them when he was 6 months and now he is 8 months and they are getting worse. He isnt crawling yet but he is an active sleeper and can definitely move around a room. Im at the stage where im paranoid someone could be hurting him although everyone is the house seems concerned and doesnt know where they could be coming from. I thought maybe he could have a blood issue and its from the way we hold him but when i took him to the doctor they accused he of hurting him and called cps. I would NEVER hurt my child hes my world so im feeling really stuck right now with what to do. Im too scared to take him to another doctor because ive been blacklisted now. Ive attached a photo of my babies back so you can see the bruises and i just want to know what other mums think or if there baby is the same and i have nothing to worry about. (Noticed the bruises in this photo this morning and they were 100% not there yesterday)