Para-aminobenzoic acid (PABA) is a chemical found in the folic acid vitamin and also in several foods including grains, eggs, milk, and meat. PABA is taken by mouth for skin conditions including vitiligo, pemphigus, dermatomyositis, morphea, lymphoblastoma cutis, Peyronie’s disease, and scleroderma. PABA is FDA approved for this skin condition. 2  However, there is only limited evidence that it is effective. 3  Viral infection in the eye (herpes keratitis). 4  Early research suggests that using a specific PABA eye solution (Actipol) as eye drops can be effective for treating viral herpes infection in the eye.