Cover the Area With Joint Compound, Sand and Paint
Use a joint knife or a putty knife to spread a layer of drywall compound approximately 1/8" thick (Image 1); feather the edges outward.
Cut pieces drywall tape two inches longer than patch and wider than the patch. Place the tape over the seams of your patch; rake the tape downward with a putty knife, then spread another wide layer of compound over the tape, again feathering the edges outward. Allow the area to dry, sand it smooth (Image 2) and apply paint.