It's hard to see in the photo, but I think that's metal corner bead underneath. It's not stucco because stucco is used outside; it's drywall mud. You've probably already fixed this being a 4 month old post, and I would assume it got chipped by moving furniture from the height of it. If you have not fixed it, I would remove all surrounding mud that's cracked. You have a couple of choices. 1. Get a can of the texture suggested in the other answers, practice on some cardboard, then spray it on your corner, let dry and repaint. 2. Get some drywall mud and a wet sponge. Scoop up the mud (you should mix it up with a drill mixer, or a stick) with the sponge and rub into the hole. Let it get tacky, not dry, then scoop up some more mud onto the sponge and dab it on trying to match the texture, let dry and paint. Don't worry, you're not going to mess it up worse. If it looks too bad, just scrape it off and start over. To make cleanup easier lay a drop cloth down over your hardwood floor and the base board. You don't have to tape it to the wall, just cover up the top of the base board and the caulk. If you don't have any of the same color of paint left you can take a chip from the hole down to Lowes, Home Depo, or whatever and their paint department will be able to match it.