The statute of limitations would be from the date of discovery of the injury or when the injury should have been discovered.
Here are the statute of limitations for South Carolina:
Professional Malpractice: Actions for medical malpractice must be commenced within 3 years of the act or omission giving rise to the injury, or 3 years from the date the injury was or reasonably should have been discovered. Medical malpractice actions for the presence of a foreign object inside the body may be filed within the initial three year period, or within two years of discovery. No medical malpractice action may be filed more than six years from the date of the underlying act or omission regardless of the date of discovery.
Personal Injury: 3 years.
Fraud: 3 years.
Libel / Slander / Defamation: 2 years.
Injury to Personal Property: 3 years.
Product Liability: 3 years.
Contracts: Written and under seal, 20 years. Otherwise, 3 years.
The Discovery Rule
Sometimes it is not reasonably possible for a person to discover the cause of an injury, or even to know that an injury has occurred, until considerably after the act which causes the injury. For example, an error in the drafting of a will might not be noticed until the will is being executed, decades after it was drafted, or a financial planner's embezzlement might not be noticed for years due to the issuance of false statements of account.
When it applies, the "discovery rule" permits a suit to be filed within a certain period of time after the injury is discovered, or reasonably should have been discovered. The discovery rule does not apply to all civil injuries, and sometimes the period of time for bringing a claim post-discovery can be short, so it is important to seek legal assistance quickly in the event of the late discovery of an injury.