It may appear unimportant to care about where to put an "*" or text word "Required" in forms, but the more complicated the type of form or application, the more it becomes a design issue. Creating a form that works for both those who can see web pages and those who can't, as well as all the physical limitations that rely on assistive software to access the Web, may be challenging.
There are many solutions out there. Cre8asiteforums visits the topic in force in Accessibility Design - Where To Put "required" In Forms?