S.C. Code Ann. § 42-15-55: Appointment of guardian ad litem for minors or mentally incompetent persons.

When a minor or mentally incompetent person is a party in a proceeding before the Workers' Compensation Commission of this State a guardian ad litem for the minor or mentally incompetent person may be appointed by a judge of probate, clerk of court, or master, if there is a master, of the county where the minor or mentally incompetent person resides or by any circuit judge or a member of the Workers' Compensation Commission.