Kligman's trio remains the gold standard treatment for melasma. It contain hydroquinone which is an effective anti-melanogenic compound but that has poor tolerance and numerous side-effects. Thiamidol has been proven to be at least as effective as hydroquinone and has a very good safety profile. The objective of this study is to compare the Kligman's trio to the same preparation in which hydroquinone is replaced by thiamidol.

Inclusion Criteria:

• SIGNED WRITTEN CONSENT 1) Melasma clinically diagnosed

Exclusion Criteria:

1. Pregnant woman
2. Other pigmentary disorder affecting the face
3. Use of systemic or topical steroids or retinoids, use of topical depigmenting agents or depigmenting procedure in the month before the inclusion