Sunscreen intolerance. Contact sensitization, photocontact sensitization, and irritancy of sunscreen agents.

Reports of contact sensitization and photocontact sensitization induced by various sunscreening agents are reviewed. Current knowledge about the most often used sunscreening agents is summarized. The problems of cross-sensitization and sensitization in photodermatoses are discussed. Strategies for patch and photopatch testing, as well as immediate-type testing, are critically evaluated.