Using Hydroquinone and Ochronosis
Rule No: 1
- Recognize melasma (chloasma, pregnancy mask)
- Rule out the differential diagnoses:
- lichen planus pigmentosus (darker skin patients (Indians), pigmentation is often seen behind the ears)
- Hori’s Nevus
- Drug-induced hyperpigmentation
- ochronosis
Rule No: 2
If the patient reports worsening of melasma with hydroquinone use, consider seriouslsy the diagnosis of ochronosis:
- Stage 3 ochronosis is easy to recognize
- Stage one is more difficult to recognize
- It can clinically mimick melasma
- It is characterized by speckled appearance and feels rough on palpation
- Dermoscopy (Dermatoscopy) can be useful to make the diagnosis
Rule No: 3
- Do not use Hydroquinone for more than 9 months. Consider changing creams if no response.
- There have been 2 case reports of ochronosis occuring after less than one year of use of Hydroquinone 2% (low concentration)… therefore it is not that rare
Contributors:
Dr Christophe HSU – dermatologist. Geneva, Switz
Source of information. Thng STG. Pigmentary Disorders. NSC Update 2012. Singapore
Category : exogenous ochronosis - Modifie le 05.16.2012Category : Hydroquinone - Modifie le 05.16.2012Category : Ochronose - Modifie le 05.16.2012Category : ochronose exogène - Modifie le 05.16.2012Category : Ochronosis - Modifie le 05.16.2012