Zoe placed the ice next to her foot so it could do its magic and she could tend to Greed. There was zero difference when he peeked because like with most wounds, the only thing that healed them was time.
She rooted around in the first aid box and took out a bottle of alcohol and a square cotton pad. She looked at him and said gently, "Um.. you need to take off your shirt." she'd have asked him to just hold it up but it was just easier to not deal with it.