Is It Safe To Use Steroid Injections And Halox Lotion For A Single Patch Of Alopecia Areata?

I am having loss of hair from root and when I showed to doctor he said it Alopecia areatea since there is only one patch in my head. But he recommended to even use Injection on my head which has steroids in that . Is it safe to use steroids. And he gave me medicine as well as to use halox lotion.