Abstract: The present invention concerns a cosmetic care method for the skin comprising the steps of applying, to the skin, a cosmetic composition comprising photoactive extracts of at least one microalgae, and exposing the area to which the composition has been applied to light. The invention also comprises a device for cosmetic care according to the method, and a kit comprising a cosmetic composition comprising photoactive extracts of at least one microalgae and a lighting device according to the invention. The invention finally comprises the use of the device according to the invention for an anti-aging and/or anti-wrinkle treatment and/or a treatment promoting the healing of the skin area.