Rub down the damaged surface of the leather couch with a leather-safe, pH-balanced cleaner. By working the cleaner into the leather with a clean rag, you will free any grime or debris and give yourself a clean surface to adhere the color to.
Apply leather recoloring balm in the same shade as the rest of the couch, using either a sponge (for large abrasions) or a cotton swab (for small areas that need precise coverage). Allow it to dry for several hours.
Protect the leather and improve its resilience by applying leather conditioner to the recolored areas. This reintroduces natural oils that restore suppleness to the upholstery.