The present invention relates to a cosmetic method intended in particular to improve the appearance of the skin and/or hair comprising the simultaneous and/or sequential administration: a) of at least one compound bioconvertible by lipase； and b) of at least one light radiation exhibiting at least one predominant wavelength which activates lipase. In particular, the said light radiation according to the invention exhibits (emits) at least one predominant wavelength which activates lipase ranging from 400 to 510 nm, preferably from 430 to 500 nm, and is preferably used at a dose ranging from 0.01 to 200 J/cm2, preferably from 0.1 to 30 J/cm2, more preferably from 1 to 30 J/cm2, indeed even from 5 to 30 J/cm2. The invention also relates to a composition comprising at least one compound bioconvertible by lipase and at least one compound which emits and/or filters, in particular under exposure to light, a light radiation exhibiting at least one predominant wavelength which activates lipase, as well as to a kit comprising at least one composition comprising at least one compound bioconvertible by lipase as well as a device and/or a compound which emits/filters a light radiation exhibiting at least one predominant wavelength which activates lipase.
