Yup. For minor issues, first aid is all that is needed; you don’t need to see a doctor for a minor cut, as long as the first aid ensures it’s not infected. But for larger things, secondary aid is what provides more long-term recovery. If someone dislocates a shoulder, first aid is putting it in a sling and bracing it against the body, so it doesn’t get worse (for instance, the tendons and ligaments in the shoulder joint can tear) before they can get to a hospital.