Swimming pool contact dermatitis caused by 1-bromo-3-chloro-5,5-dimethyl hydantoin.

Background: Bromo-3-chloro-5,5-dimethylhydantoin (BCDMH) is a chemical used as a disinfectant for recreational water. BCDMH was described as being responsible for an epidemic of irritant contact dermatitis in the UK (1983), and its sensitizing capacity was also discussed.

Objectives: The aim of this study was to assess whether BCDMH used to disinfect swimming pools and spas can cause allergic contact dermatitis among its users.

Two cases of photocontact allergy to the new sun filter octocrylene.

We report two cases of photocontact allergy to a cinnamate sun filter, octocrylene. In the last few years octocrylene has been broadly used in the manufacturing of many cosmetics and UV filters, hence the importance of octocrylene as an emerging cause of contact and photocontact allergy.