I, too, have always bruised easily.  I cannot count the days I have discovered bruises I could not account for.  It’s just one of things I’ve always attributed to being clumsy, or being CAH-related.  I still don’t know which, but it has never interfered with my life.  And that’s my suggestion for you as a parent.  Do nothing.  Let your child play like every other kid.  There may be a little more brusing involved, but for me, it has never been more than an aesthetic issue.  I hope it’s the same for your child.  Take care, Eric