My 4 year old son has a small, faint bruise on his spine (lower thoracic, upper lumbar region). It is small, faint, but has been there for about 8 months. I just noticed tonight that it had not yet gone away. Could this be a result of a bone bruise? Should I be concerned? He is a typical toddler and gets many bruises from bikes, soccer, etc...all which heal very quickly.