Injury is one which only minor injuries occur and which can normally be handled by a trained first aid person. This also includes initial treatment and a one-time follow-up visit even if treated by a physician. However, once prescription medication is provided or stitches are required, the injury is then required to be classified as a recordable injury per OSHA.
Merriam-Webster Online Dictionary
first aid (noun) emergency care or treatment given to an ill or injured person before regular medical aid can be obtained
Emergency care, initial treatment, immediate assistance, urgent aid, preliminary help
