Ochronose exogène (Pour les professionnels)
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…