S.C. Code Ann. § 40-5-80
This chapter shall not be construed so as to prevent a citizen from prosecuting or defending his own cause, if he so desires, or the cause of another, with leave of the court first had and obtained; provided, that he declare on oath, if required, that he neither has accepted nor will accept or take any fee, gratuity or reward on account of such prosecution or defense or for any other matter relating to the cause.