In Harry Potter and the Deathly Hallows, when Hermione Apparates Ron from the Black manor to the forest, Ron suffers and Apparation accident (Splinching): a large chunk of meat is missing from his upper arm. Hermione gives him magical first aid, but she can't put him completely right because she isn't experienced in healing magic. They are unable to seek professional help about the injury, because they are a fugitives.
However, I don't remember Ron's injury mentioned again later in the book. How much lasting injury did Ron suffer? Did it heal completely already during the war? Could something be done to fix it after the war, months later?