Is it permissible to use food items—such as black seed oil—in the treatment of illnesses—like hemorrhoids and anal diseases—and is it permissible to use them in the bathroom?

It is permissible to use ingestible substances in the treatment of diseases if specialists approve of it. The benefit of black seed as a cure has been legally established. It is permissible to use it in the bathroom or elsewhere when there is a need to expose one's awrah, in order to preserve it.