Insert a premade canvas patch behind the hole using a pair of tweezers. Stick the canvas patch through the hole, and spread it out flat behind the leather
Dab leather glue around the patch's edges, pressing the leather down on top of the patch to adhere. Let it dry for 30 minutes.
Spread the leather-safe filler across the patch using a palette knife. Only a thin layer is needed to bring the patch's level up to the leather's level.
Dry out the filler using a blow dryer on low for 15 minutes. This will set the material.
Dab leather recoloring balm or dye over the repaired area with a cotton swab to match the rest of the leather. Let it dry for several hours.
Treat the entire leather item with a leather conditioning cream, wiping away the excess with a sponge. This will hydrate the leather, preventing the surface from drying out and tugging at the repaired area.