What could the painless, recurring scabs on my right hip be? they're brown, rough, crater-like, and scars in pencil eraser-sized donut shapes.

It depends,, : It depends on how and when these started. If your hip was exposed to the outside environment, they might be infectious in origin, like sporothrix which can be from rose thorns. If you changed detergents or have a different material undergarment, they could be a form of dermatitis. You might have an issue like lupus with skin lesions as a side effect. It would be smart to see a derm/skin dr..