Effects of allergen controlled cosmetics on hyperpigmented dermatitis.

Prior to the late 1970s, cosmetic dermatitis was quite common in Japan. Once sensitizers were established, in cosmetics, soaps, shampoos, and other commonly used substances, effective treatment was only possible if the cycle of recrudescence could be broken. The Allergen Controlled System accomplished this by preventing contact with the main contact sensitizers. Although the number of cases of pigmented cosmetic dermatitis has declined because of restrictions on the use of several major sensitizers, the Allergen Controlled System remains an effective treatment for the cases that still occur.