I scratch my left sclera and it hurt is there anything to heal it or how to treat it?

Unlikely sclera: You probably scratched the conjunctiva overlying your sclera. This commonly causes a dramatic sort of hemorrhage with bleeding atop the sclera and under the conjunctiva. If the vision is good, the item which scratched you is uncontaminated , and there is no pus or tissue swelling, then you can wait it out. But if there is any doubt, see your ophthalmologist for diagnosis and treatment if needed.

Get examined: Superficial scratches usually heal quickly on their own, but you should see your eye doctor to determine the severity and prescribe prophylactic antibiotic drops to prevent infection.