• Allergic photocontact dermatitis developed in a patient to a commercial sunscreen preparation containing paraaminobenzoic acid (PABA) in an alcohol base. Photopatch testing showed photosensitivity to PABA. Sensitization could only be detected when PABA was tested in an alcohol vehicle; a photopatch test to PABA in petrolatum was negative.
(Arch Dermatol 114:1665-1666, 1978)
Mathias CGT, Maibach HI, Epstein J. Allergic Contact Photodermatitis to Para-aminobenzoic Acid. Arch Dermatol. 1978;114(11):1665-1666. doi:10.1001/archderm.1978.01640230039010