Performing non-therapeutic cosmetic treatment, comprises: subjecting skin to a mechanical action using a device having first and second contact elements adjacent and movable with respect to each other, preferably with an oscillating motion, and in contact with the skin; and applying a cosmetic composition to the skin before, during and/or after the subjecting step, where the composition comprises an agent for reducing a visibility of pore size and/or improving shininess. ACTIVITY : Dermatological. MECHANISM OF ACTION : None given.
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