My grandson will be 3 on October 28. My daughter just sent me a picture of him with bruising on his lower back and buttocks, asking me if I knew what it was. We re all freaking out because it looks like he has been abused. He is in daycare 3 days a week at a very reputable place. She first noticed the marks on Friday evening, but she says they ve gotten much worse. She is going to call her pediatrician in the morning, but in the meantime, can you tell me if there is something other than abuse that could cause this?