Where I'm from they call that 'popcorn' but, whatever.
They make an 'acoustical ceiling repair' product that is sold at the big orange store. There are several varieties depending on the texture of your ceiling. They are in a pressurized can and only cover about a 2' x 2' area. So it might be just right for your application. Be sure to mask the wall and floor with plastic sheeting, the stuff is messy. And, as always, 'For best results, follow label directions'
Good luck.