The present invention relates to a use of an extract of artemisia montana as a cosmetic, in particular as a cosmetic thinner. The present invention also relates to a cosmetic or dermatological composition comprising an extract of a vehicle and artemisia montana cosmetically and / or dermatologically acceptable medium, as well as to a cosmetic process for reducing the excess fat cells and / or cellulitis, comprising an application to the skin of a cosmetic composition according to the invention and to a device comprising this composition.
