The place to start is your employment agreement. The agreement should lay out the policies and procedures which are triggered by an employee reporting an injury. Once an employee is injured, the employer must follow the policy, even if the injury doesn't seem to warrant such a response. If you're still concerned, speak with a local employment attorney.
This does not create and attorney client relationship. As with all legal matters, you should contact an attorney in your jurisdiction who is familiar with the are of law in which you need assistance. You should make contact and seek advise as soon as possible as some claims have time limits and restrictions. Complete and accurate legal guidance cannot be guaranteed without a complete understanding of all aspects of your issue or potential claim.