Cosmetic treatment of keratin material comprises at least one step comprising: (a) setting lyophilizate comprising at least one plant extract, where the plant extract is obtained by infusion, decoction or maceration of at least one plant substance, in warm or cold water； (b) setting a medium, distinct from the lyophilizate； (c) extemporaneously contacting the lyophilizate with the medium in a favorable condition for solubilization and/or dispersion of the lyophilizate in the medium； and (d) contacting the obtained medium with keratin material. Independent claims are included for: (1) the lyophilizate comprising at least one plant extract, where the plant extract is obtained by infusion, decoction or maceration of at least one plant substance； (2) extemporaneous product for of cosmetic or dermatological care of a keratin material comprising at least one first cosmetic or dermatological composition and a second composition different from the first composition, comprising at least one lyophilizate comprising the plant extract； and (3) conditioning set comprising at least one: first compartment containing the lyophilizate comprising the plant extract； a second compartment containing medium, distinct from the lyophilizate, where the second compartment is, prior to use of the set, isolated from the first； and means for, in response to a command, enabling communication of the first and second compartments, and contacting the lyophilizate and the medium. ACTIVITY : Endocrine-Gen.； Antiparasitic； Insecticide； Analgesic； Dermatological； Antiinflammatory； Antipsoriatic； Antilichen； Antipruritic. MECHANISM OF ACTION : None given.
