The invention relates to a stepwise treatment method for the lips and/or the lip area, said method being used for volumizing and/or smoothing the lips and lip area in order to provide a cosmetic effect. An essential feature of the invention is that according to step 1 the lips/lip area are cleansed and protected from UV radiation, whereupon in step 2 onto the lips/lip area is spread activatable composition providing the volumizing and/or smoothing cosmetic effect, and that during the spreading operation and/or thereafter onto the lips/lip area is performed in accordance with step 3 an absorption operation to activate the applied composition and absorb the same by light treatment at a spectral wavelength of 420 - 480 nm, and that thereupon the effect of the cosmetic treatment is maintained in accordance with step 4 by regular treatments maintaining and activating the cosmetic effect.
