Hair loss, unfortunately, is a common symptoms of Lupus. In almost all cases, it does grow back. Like you, I had several completely bald spots on my head and had to wear a wig for a time.
My hair did grow back, but it was not the same thickness or grade as before. My hair is now a very fine texture, extremely curly, and very soft. Before it was so thick that it was a nuisance, it was always very curly, but it was also coarse. I actually like my new grade of hair because it is much more manageable than before. However, this does not happen to everyone. Some find that their hair grew back exactly as it had been before.
Now, with any new growth of hair, it will, at first, come in like baby fine hair. You will have to treat this new hair gently and take care of it while your hair regenerates. As you know, your hair is continually growing. So, you must condition it, cut it, and keep it protected while it grows. But, it will grow back!
Peace and Blessings
Look For The Good and Praise It!