Topical carbocysteine: A new option for the treatment of ichthyosis.

N-acetylcysteine in combination with urea is effective for the treatment of congenital ichthyosis. Although it is well tolerated, its foul smell may compromise treatment adherence. Carbocysteine is a similar molecule without that bad odor. Thus, we have tried a new formula with carbocysteine for the treatment of 4 patients with ichthyosis, with positive results.