Actions arising out of any provision of this article shall be commenced within a four-year period of the accrual of the cause of action; however, if a person liable under this article conceals the cause of action from the knowledge of the person entitled to bring the action, the period prior to the discovery of his cause of action by the person entitled to bring such action shall be excluded in determining the time limited for the commencement of the action.
OCGA § 10-1-625