does anyone know of any medical condition with re-occurring lower spinal bruisin!

My 3 y.o daughter gets these bruises on her lower spine that comes and goes in the same spot. My daughter was an infant when I picked up on the mysterious bruising but didn't think anything of it. As she is getting older, it still occurs in the same location of her lower back mainly on her spine. She now daily complains of her tummy hurting and no other symptoms but when I touch her spine all the way up she says it hurts. Does anyone know what this is? Some kind of rare disease/disorder or cancer or something else altogether. Medical history: after MMR & Hib
Vaccines she developed type A flu with strep throat and also went deaf for 3 months and regressed
developmentally. She since recovered mostly and is doing very well but she has been getting sick more frequently than the rest of us. recently Bronchitis 2 times in less than 2 months with other viral infections back to back. She now suffers some kind of gastro intestinal something that isn't going away. She was born with Laryngomalacia - immature cartilage of the epiglotis-unrelated to this. Any parents who might be able to help me out please leave response.