Section : Conference Notes

Exogenous Ochronosis (EO) (For Professionals)

  • Causes: resorcinol, phenol and mercury.
  • Risk factors: olive or dark skin, failure to use sunprotection.
  • Occurs with prolonged use of hydroquinone (HQ) at a concentration of more than 3%.
  • FDA banned OTC (Over-the-counter) sale due to toxicology issues and uncertain long term cancer risk. However, it is considered safe when used at a concentration of 2% or less under the supervision of a physician.


Dr Christophe HSU – dermatologist. Geneva, Switzerland

Source of Information: Alrawashdeh B. Melasma Update. Dubai World Dermatology & Laser Conference & Exhibition – Dubai Derma 13 – Dubai, United Arab Emirates (UAE)

Category : ochronose exogène - Modifie le 04.17.2013